deprecate module

(according to
https://lists.apache.org/thread.html/r29afb8efbdffd304f5ee7a4071f25085ffe4b1da025eb47be3ec3fc3%40%3Cdev.sling.apache.org%3E)
diff --git a/.asf.yaml b/.asf.yaml
new file mode 100644
index 0000000..27d9d52
--- /dev/null
+++ b/.asf.yaml
@@ -0,0 +1,7 @@
+github:
+  description: "Apache Sling Subsystems Installer  (deprecated)"
+  homepage: "https://sling.apache.org/"
+  labels:
+    - java
+    - sling
+    - deprecated
\ No newline at end of file
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
deleted file mode 100644
index 0fa18e5..0000000
--- a/CODE_OF_CONDUCT.md
+++ /dev/null
@@ -1,22 +0,0 @@
-<!--/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  ~ Licensed to the Apache Software Foundation (ASF) under one
-  ~ or more contributor license agreements.  See the NOTICE file
-  ~ distributed with this work for additional information
-  ~ regarding copyright ownership.  The ASF licenses this file
-  ~ to you under the Apache License, Version 2.0 (the
-  ~ "License"); you may not use this file except in compliance
-  ~ with the License.  You may obtain a copy of the License at
-  ~
-  ~   http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing,
-  ~ software distributed under the License is distributed on an
-  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-  ~ KIND, either express or implied.  See the License for the
-  ~ specific language governing permissions and limitations
-  ~ under the License.
-  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/-->
-Apache Software Foundation Code of Conduct
-====
-
-Being an Apache project, Apache Sling adheres to the Apache Software Foundation's [Code of Conduct](https://www.apache.org/foundation/policies/conduct.html).
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
deleted file mode 100644
index ac82a1a..0000000
--- a/CONTRIBUTING.md
+++ /dev/null
@@ -1,24 +0,0 @@
-<!--/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  ~ Licensed to the Apache Software Foundation (ASF) under one
-  ~ or more contributor license agreements.  See the NOTICE file
-  ~ distributed with this work for additional information
-  ~ regarding copyright ownership.  The ASF licenses this file
-  ~ to you under the Apache License, Version 2.0 (the
-  ~ "License"); you may not use this file except in compliance
-  ~ with the License.  You may obtain a copy of the License at
-  ~
-  ~   http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing,
-  ~ software distributed under the License is distributed on an
-  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-  ~ KIND, either express or implied.  See the License for the
-  ~ specific language governing permissions and limitations
-  ~ under the License.
-  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/-->
-Contributing
-====
-
-Thanks for choosing to contribute!
-
-You will find all the necessary details about how you can do this at https://sling.apache.org/contributing.html.
diff --git a/Jenkinsfile b/Jenkinsfile
deleted file mode 100644
index f582519..0000000
--- a/Jenkinsfile
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-slingOsgiBundleBuild()
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index d645695..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,202 +0,0 @@
-
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
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-
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-      direction or management of such entity, whether by contract or
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-      by You to the Licensor shall be under the terms and conditions of
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-      the terms of any separate license agreement you may have executed
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-   6. Trademarks. This License does not grant permission to use the trade
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-   distributed under the License is distributed on an "AS IS" BASIS,
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-   See the License for the specific language governing permissions and
-   limitations under the License.
diff --git a/README.md b/README.md
index 055ee97..5218c42 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 [<img src="https://sling.apache.org/res/logos/sling.png"/>](https://sling.apache.org)
 
- [![Build Status](https://builds.apache.org/buildStatus/icon?job=Sling/sling-org-apache-sling-installer-factory-subsystems/master)](https://builds.apache.org/job/Sling/job/sling-org-apache-sling-installer-factory-subsystems/job/master) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.apache.sling/org.apache.sling.installer.factory.subsystems/badge.svg)](https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.apache.sling%22%20a%3A%22org.apache.sling.installer.factory.subsystems%22) [![JavaDocs](https://www.javadoc.io/badge/org.apache.sling/org.apache.sling.installer.factory.subsystems.svg)](https://www.javadoc.io/doc/org.apache.sling/org.apache.sling.installer.factory.subsystems) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0) [![installer](https://sling.apache.org/badges/group-installer.svg)](https://github.com/apache/sling-aggregator/blob/master/docs/groups/installer.md)
+# Apache Sling Subsystems Installer (deprecated)
 
-# Apache Sling Subsystems Installer
+This module is no longer maintained.
 
-This module is part of the [Apache Sling](https://sling.apache.org) project.
+For reference or potential bugfix releases use branch [maintenance](https://github.com/apache/sling-org-apache-sling-installer-factory-subsystems/tree/maintenance).
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
deleted file mode 100644
index 33a14ed..0000000
--- a/pom.xml
+++ /dev/null
@@ -1,86 +0,0 @@
-<!--
- Licensed to the Apache Software Foundation (ASF) under one
- or more contributor license agreements.  See the NOTICE file
- distributed with this work for additional information
- regarding copyright ownership.  The ASF licenses this file
- to you under the Apache License, Version 2.0 (the
- "License"); you may not use this file except in compliance
- with the License.  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing,
- software distributed under the License is distributed on an
- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- KIND, either express or implied.  See the License for the
- specific language governing permissions and limitations
- under the License.
--->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <parent>
-        <groupId>org.apache.sling</groupId>
-        <artifactId>sling</artifactId>
-        <version>26</version>
-        <relativePath/>
-    </parent>
-
-    <artifactId>org.apache.sling.installer.factory.subsystems</artifactId>
-    <version>1.0.1-SNAPSHOT</version>
-    <packaging>bundle</packaging>
-
-    <name>Apache Sling Subsystems Installer</name>
-    <description> 
-        Provides support for subsystems to the Apache Sling OSGi installer
-    </description>
-
-    <scm>
-        <connection>scm:git:https://gitbox.apache.org/repos/asf/sling-org-apache-sling-installer-factory-subsystems.git</connection>
-        <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/sling-org-apache-sling-installer-factory-subsystems.git</developerConnection>
-        <url>https://gitbox.apache.org/repos/asf?p=sling-org-apache-sling-installer-factory-subsystems.git</url>
-    </scm>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.felix</groupId>
-                <artifactId>maven-bundle-plugin</artifactId>
-                <extensions>true</extensions>
-                <configuration>
-                    <instructions>
-                        <Bundle-Activator>
-                            org.apache.sling.installer.factories.subsystems.impl.Activator
-                        </Bundle-Activator>
-                        <Private-Package>
-                            org.apache.sling.installer.factories.subsystems.impl.*
-                        </Private-Package>
-                    </instructions>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.osgi</groupId>
-            <artifactId>org.osgi.core</artifactId>
-            <version>5.0.0</version>
-        </dependency>
-        <dependency>
-            <groupId>org.osgi</groupId>
-            <artifactId>org.osgi.compendium</artifactId>
-            <version>5.0.0</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.sling</groupId>
-            <artifactId>org.apache.sling.installer.api</artifactId>
-            <version>1.0.0</version>
-            <scope>provided</scope>
-        </dependency>
-    </dependencies>
-</project>
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/Activator.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/Activator.java
deleted file mode 100644
index 8429b8d..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/Activator.java
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import java.util.Dictionary;
-import java.util.Hashtable;
-
-import org.apache.sling.installer.api.tasks.InstallTaskFactory;
-import org.apache.sling.installer.api.tasks.ResourceTransformer;
-import org.osgi.framework.BundleActivator;
-import org.osgi.framework.BundleContext;
-import org.osgi.framework.Constants;
-import org.osgi.framework.ServiceReference;
-import org.osgi.framework.ServiceRegistration;
-import org.osgi.service.subsystem.Subsystem;
-import org.osgi.service.subsystem.SubsystemConstants;
-import org.osgi.util.tracker.ServiceTracker;
-import org.osgi.util.tracker.ServiceTrackerCustomizer;
-
-public class Activator implements BundleActivator {
-
-    /** The service tracker for the root subsystem */
-    private ServiceTracker<Subsystem, Subsystem> rootSubsystemTracker;
-
-    /** The service registration for the installer service. */
-    private ServiceRegistration<?> serviceReg;
-
-    /**
-     * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
-     */
-    public void start(final BundleContext context) throws Exception {
-        this.rootSubsystemTracker = new ServiceTracker<Subsystem, Subsystem>(context,
-            context.createFilter("(&(" + Constants.OBJECTCLASS + "=" + Subsystem.class.getName() + ")" +
-             "(" + SubsystemConstants.SUBSYSTEM_ID_PROPERTY + "=0))"),
-
-             new ServiceTrackerCustomizer<Subsystem, Subsystem>() {
-
-                public Subsystem addingService(final ServiceReference<Subsystem> reference) {
-                    final Subsystem service = context.getService(reference);
-                    if ( service != null ) {
-                        registerInstaller(context, service);
-                    }
-                    return service;
-                }
-
-                public void modifiedService(final ServiceReference<Subsystem> reference, final Subsystem service) {
-                    // nothing to do
-                }
-
-                public void removedService(final ServiceReference<Subsystem> reference, final Subsystem service) {
-                    unregisterInstaller();
-                }
-
-        });
-        this.rootSubsystemTracker.open();
-    }
-
-    /**
-     * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
-     */
-    public void stop(final BundleContext context) throws Exception {
-        if ( this.rootSubsystemTracker != null ) {
-            this.rootSubsystemTracker.close();
-            this.rootSubsystemTracker = null;
-        }
-        this.unregisterInstaller();
-    }
-
-    private void registerInstaller(final BundleContext context, final Subsystem rootSubsystem) {
-        final Dictionary<String, Object> props = new Hashtable<String, Object>();
-        props.put(Constants.SERVICE_DESCRIPTION, "Apache Sling Installer Support for Subsystems");
-        props.put(Constants.SERVICE_VENDOR, "The Apache Software Foundation");
-        this.serviceReg = context.registerService(
-                new String[] {ResourceTransformer.class.getName(), InstallTaskFactory.class.getName()},
-                new SubsystemInstaller(rootSubsystem, context), props);
-    }
-
-    private void unregisterInstaller() {
-        if ( serviceReg != null ) {
-            serviceReg.unregister();
-            serviceReg = null;
-        }
-    }
-}
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/InstallSubsystemTask.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/InstallSubsystemTask.java
deleted file mode 100644
index 0b1086f..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/InstallSubsystemTask.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import java.io.IOException;
-
-import org.apache.sling.installer.api.tasks.ChangeStateTask;
-import org.apache.sling.installer.api.tasks.InstallTask;
-import org.apache.sling.installer.api.tasks.InstallationContext;
-import org.apache.sling.installer.api.tasks.ResourceState;
-import org.apache.sling.installer.api.tasks.TaskResource;
-import org.apache.sling.installer.api.tasks.TaskResourceGroup;
-import org.osgi.service.subsystem.Subsystem;
-
-/**
- * This is the subsystem install task.
- */
-public class InstallSubsystemTask extends InstallTask {
-
-    private static final String INSTALL_ORDER = "53-";
-
-    private final Subsystem rootSubsystem;
-
-    public InstallSubsystemTask(final TaskResourceGroup grp, final Subsystem rootSubsystem) {
-        super(grp);
-        this.rootSubsystem = rootSubsystem;
-    }
-
-    @Override
-    public void execute(final InstallationContext ctx) {
-        final TaskResource tr = this.getResource();
-        ctx.log("Installing new subsystem from {}", tr);
-
-        try {
-            final Subsystem sub = this.rootSubsystem.install(tr.getURL(), tr.getInputStream());
-            ctx.addTaskToCurrentCycle(new StartSubsystemTask(this.getResourceGroup(), sub));
-            ctx.log("Installed new subsystem {}", sub);
-        } catch (final IOException e) {
-            ctx.log("Unable to install subsystem {} : {}", tr, e);
-            ctx.addTaskToCurrentCycle(new ChangeStateTask(this.getResourceGroup(), ResourceState.IGNORED));
-        }
-    }
-
-    @Override
-    public String getSortKey() {
-        return INSTALL_ORDER + getResource().getURL();
-    }
-}
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/StartSubsystemTask.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/StartSubsystemTask.java
deleted file mode 100644
index a5eb224..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/StartSubsystemTask.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import org.apache.sling.installer.api.tasks.ChangeStateTask;
-import org.apache.sling.installer.api.tasks.InstallTask;
-import org.apache.sling.installer.api.tasks.InstallationContext;
-import org.apache.sling.installer.api.tasks.ResourceState;
-import org.apache.sling.installer.api.tasks.TaskResource;
-import org.apache.sling.installer.api.tasks.TaskResourceGroup;
-import org.osgi.service.subsystem.Subsystem;
-
-/**
- * This is the subsystem start task.
- */
-public class StartSubsystemTask extends InstallTask {
-
-    private static final String INSTALL_ORDER = "55-";
-
-    private final Subsystem subsystem;
-
-    public StartSubsystemTask(final TaskResourceGroup grp, final Subsystem system) {
-        super(grp);
-        this.subsystem = system;
-    }
-
-    @Override
-    public void execute(final InstallationContext ctx) {
-        final TaskResource tr = this.getResource();
-        ctx.log("Starting subsystem from {}", tr);
-
-        this.subsystem.start();
-        ctx.addTaskToCurrentCycle(new ChangeStateTask(this.getResourceGroup(), ResourceState.INSTALLED));
-        ctx.log("Started subsystem {}", this.subsystem);
-    }
-
-    @Override
-    public String getSortKey() {
-        return INSTALL_ORDER + getResource().getURL();
-    }
-}
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/SubsystemInstaller.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/SubsystemInstaller.java
deleted file mode 100644
index c58d7a3..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/SubsystemInstaller.java
+++ /dev/null
@@ -1,331 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.jar.Manifest;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-
-import org.apache.sling.installer.api.InstallableResource;
-import org.apache.sling.installer.api.tasks.ChangeStateTask;
-import org.apache.sling.installer.api.tasks.InstallTask;
-import org.apache.sling.installer.api.tasks.InstallTaskFactory;
-import org.apache.sling.installer.api.tasks.RegisteredResource;
-import org.apache.sling.installer.api.tasks.ResourceState;
-import org.apache.sling.installer.api.tasks.ResourceTransformer;
-import org.apache.sling.installer.api.tasks.TaskResource;
-import org.apache.sling.installer.api.tasks.TaskResourceGroup;
-import org.apache.sling.installer.api.tasks.TransformationResult;
-import org.osgi.framework.BundleContext;
-import org.osgi.framework.InvalidSyntaxException;
-import org.osgi.framework.ServiceReference;
-import org.osgi.framework.Version;
-import org.osgi.service.subsystem.Subsystem;
-import org.osgi.service.subsystem.Subsystem.State;
-import org.osgi.service.subsystem.SubsystemConstants;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * This is an extension for the OSGi installer
- * It listens for files ending with ".esa" and a proper subsystem manifest.
- * Though subsystems does not require a complete manifest, the installer supports
- * only subsystems with the basic info (name and version).
- *
- * As subsystems currently do not support an update, an uninstall/install is done
- * instead - which will lose bundle private data, bound configurations etc.
- */
-public class SubsystemInstaller
-    implements ResourceTransformer, InstallTaskFactory {
-
-    private static final String TYPE_SUBSYSTEM = "esa";
-
-    private final Logger logger = LoggerFactory.getLogger(this.getClass());
-
-    private final Subsystem rootSubsystem;
-
-    private final BundleContext bundleContext;
-
-    public SubsystemInstaller(final Subsystem root, final BundleContext bundleContext) {
-        this.rootSubsystem = root;
-        this.bundleContext = bundleContext;
-    }
-
-    /**
-     * @see org.apache.sling.installer.api.tasks.ResourceTransformer#transform(org.apache.sling.installer.api.tasks.RegisteredResource)
-     */
-    public TransformationResult[] transform(final RegisteredResource resource) {
-        if ( resource.getType().equals(InstallableResource.TYPE_FILE) ) {
-            if ( resource.getURL().endsWith("." + TYPE_SUBSYSTEM) ) {
-                logger.info("Found potential subsystem resource {}", resource);
-                final SubsystemInfo headers = readSubsystemHeaders(resource);
-                if ( headers != null ) {
-                    // check the version for validity
-                    boolean validVersion = true;
-                    try {
-                        new Version(headers.version);
-                    } catch (final IllegalArgumentException iae) {
-                        logger.info("Rejecting subsystem {} from {} due to invalid version information: {}.",
-                                new Object[] {headers.symbolicName, resource, headers.version});
-                        validVersion = false;
-                    }
-                    if ( validVersion ) {
-                        final Map<String, Object> attr = new HashMap<String, Object>();
-                        attr.put(SubsystemConstants.SUBSYSTEM_SYMBOLICNAME, headers.symbolicName);
-                        attr.put(SubsystemConstants.SUBSYSTEM_VERSION, headers.version);
-
-                        final TransformationResult tr = new TransformationResult();
-                        tr.setId(headers.symbolicName);
-                        tr.setResourceType(TYPE_SUBSYSTEM);
-                        tr.setAttributes(attr);
-                        tr.setVersion(new Version(headers.version));
-
-                        return new TransformationResult[] {tr};
-                    }
-
-                } else {
-                    logger.info("Subsystem resource does not have required headers.");
-                }
-            }
-        }
-        return null;
-    }
-
-    /**
-     * Check that the required attributes are available.
-     * This is just a sanity check
-     */
-    private SubsystemInfo checkResource(final TaskResourceGroup toActivate) {
-        final TaskResource rsrc = toActivate.getActiveResource();
-
-        SubsystemInfo result = null;
-        final String symbolicName = (String) rsrc.getAttribute(SubsystemConstants.SUBSYSTEM_SYMBOLICNAME);
-        if ( symbolicName == null ) {
-            logger.error("Subsystem resource is missing symbolic name {}", rsrc);
-        } else {
-            final String version = (String)rsrc.getAttribute(SubsystemConstants.SUBSYSTEM_VERSION);
-            if ( version == null ) {
-                logger.error("Subsystem resource is missing version {}", rsrc);
-            } else {
-                // check the version for validity
-                boolean validVersion = true;
-                try {
-                    new Version(version);
-                } catch (final IllegalArgumentException iae) {
-                    logger.info("Rejecting subsystem {} from {} due to invalid version information: {}.",
-                            new Object[] {symbolicName, rsrc, version});
-                    validVersion = false;
-                }
-                if ( validVersion ) {
-                    result = new SubsystemInfo();
-                    result.symbolicName = symbolicName;
-                    result.version = version;
-                }
-            }
-        }
-        return result;
-    }
-
-    private ServiceReference<Subsystem> getSubsystemReference(final String symbolicName) {
-        // search a subsystem with the symbolic name
-        ServiceReference<Subsystem> ref = null;
-        try {
-            final Collection<ServiceReference<Subsystem>> refs = this.bundleContext.getServiceReferences(Subsystem.class, "(subsystem.symbolicName=" + symbolicName + ")");
-            if ( refs.size() > 0 ) {
-                ref = refs.iterator().next();
-            }
-        } catch (final InvalidSyntaxException e) {
-            logger.error("Problem searching for subsystem with symbolic name " + symbolicName, e);
-        }
-        return ref;
-    }
-
-    /**
-     * @see org.apache.sling.installer.api.tasks.InstallTaskFactory#createTask(org.apache.sling.installer.api.tasks.TaskResourceGroup)
-     */
-    public InstallTask createTask(final TaskResourceGroup toActivate) {
-        final InstallTask result;
-
-        final TaskResource rsrc = toActivate.getActiveResource();
-        if ( rsrc.getType().equals(TYPE_SUBSYSTEM) ) {
-
-            // check if the required info is available
-            final SubsystemInfo info = checkResource(toActivate);
-            if ( info == null ) {
-                // ignore as info is missing
-                result = new ChangeStateTask(toActivate, ResourceState.IGNORED);
-            } else {
-                // search a subsystem with the symbolic name
-                final ServiceReference<Subsystem> ref = this.getSubsystemReference(info.symbolicName);
-
-                final Subsystem currentSubsystem = (ref != null ? this.bundleContext.getService(ref) : null);
-                try {
-                    final Version newVersion = new Version(info.version);
-                    final Version oldVersion = (ref == null ? null : (Version)ref.getProperty("subsystem.version"));
-
-                    // Install
-                    if ( rsrc.getState() == ResourceState.INSTALL ) {
-                        if ( oldVersion != null ) {
-
-                            final int compare = oldVersion.compareTo(newVersion);
-                            if (compare < 0) {
-                                // installed version is lower -> update
-                                result = new UpdateSubsystemTask(toActivate, this.bundleContext, ref, this.rootSubsystem);
-                            } else if ( compare == 0 && isSnapshot(newVersion) ) {
-                                // same version but snapshot -> update
-                                result = new UpdateSubsystemTask(toActivate, this.bundleContext, ref, this.rootSubsystem);
-                            } else if ( compare == 0 && currentSubsystem != null && currentSubsystem.getState() != State.ACTIVE ) {
-                                // try to start the version
-                                result = new StartSubsystemTask(toActivate, currentSubsystem);
-                            } else {
-                                logger.info("{} is not installed, subsystem with same or higher version is already installed: {}", info, newVersion);
-                                result = new ChangeStateTask(toActivate, ResourceState.IGNORED);
-                            }
-                        } else {
-                            result = new InstallSubsystemTask(toActivate, this.rootSubsystem);
-                        }
-
-                    // Uninstall
-                    } else if ( rsrc.getState() == ResourceState.UNINSTALL ) {
-                        if ( oldVersion == null ) {
-                            logger.error("Nothing to uninstall. {} is currently not installed.", info);
-                            result = new ChangeStateTask(toActivate, ResourceState.IGNORED);
-                        } else {
-
-                            final int compare = oldVersion.compareTo(newVersion);
-                            if ( compare == 0 ) {
-                                result = new UninstallSubsystemTask(toActivate, this.bundleContext, ref);
-                            } else {
-                                logger.error("Nothing to uninstall. {} is currently not installed, different version is installed {}", info, oldVersion);
-                                result = new ChangeStateTask(toActivate, ResourceState.IGNORED);
-                            }
-                        }
-                    } else {
-                        result = null;
-                    }
-                } finally {
-                    if ( currentSubsystem != null ) {
-                        this.bundleContext.ungetService(ref);
-                    }
-                }
-            }
-        } else {
-            result = null;
-        }
-        return result;
-    }
-
-    /**
-     * Read the manifest from supplied input stream, which is closed before return.
-     */
-    private static Manifest getManifest(final RegisteredResource rsrc, final Logger logger)
-    throws IOException {
-        final InputStream ins = rsrc.getInputStream();
-
-        Manifest result = null;
-
-        if ( ins != null ) {
-            ZipInputStream jis = null;
-            try {
-                jis = new ZipInputStream(ins);
-
-                ZipEntry entry;
-
-                while ( (entry = jis.getNextEntry()) != null ) {
-                    if (entry.getName().equals("OSGI-INF/SUBSYSTEM.MF") ) {
-                        result = new Manifest(jis);
-                    }
-                }
-
-            } finally {
-
-                // close the jar stream or the input stream, if the jar
-                // stream is set, we don't need to close the input stream
-                // since closing the jar stream closes the input stream
-                if (jis != null) {
-                    try {
-                        jis.close();
-                    } catch (IOException ignore) {
-                    }
-                } else {
-                    try {
-                        ins.close();
-                    } catch (IOException ignore) {
-                    }
-                }
-            }
-        }
-        return result;
-    }
-
-    final static public class SubsystemInfo {
-        public String symbolicName;
-        public String version;
-        @Override
-
-        public String toString() {
-            return "Subsystem[symbolicName=" + symbolicName + ", version="
-                    + version + "]";
-        }
-
-    }
-
-    /**
-     * Read the subsystem info from the manifest (if available)
-     */
-    private SubsystemInfo readSubsystemHeaders(final RegisteredResource resource) {
-        try {
-            final Manifest m = SubsystemInstaller.getManifest(resource, logger);
-            if (m != null) {
-                final String sn = m.getMainAttributes().getValue(SubsystemConstants.SUBSYSTEM_SYMBOLICNAME);
-                if (sn != null) {
-                    final String v = m.getMainAttributes().getValue(SubsystemConstants.SUBSYSTEM_VERSION);
-                    final int paramPos = sn.indexOf(';');
-                    final String symbolicName = (paramPos == -1 ? sn : sn.substring(0, paramPos));
-                    final SubsystemInfo headers = new SubsystemInfo();
-                    headers.symbolicName = symbolicName;
-                    headers.version = v;
-
-                    // if no version is specified, use default version
-                    if ( headers.version == null ) {
-                        headers.version = "0.0.0.0";
-                    }
-                    return headers;
-                }
-            }
-        } catch (final IOException ignore) {
-            // ignore
-        }
-        return null;
-    }
-
-    private static final String MAVEN_SNAPSHOT_MARKER = "SNAPSHOT";
-
-    /**
-     * Check if the version is a snapshot version
-     */
-    public static boolean isSnapshot(final Version v) {
-        return v.toString().indexOf(MAVEN_SNAPSHOT_MARKER) >= 0;
-    }
-}
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UninstallSubsystemTask.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UninstallSubsystemTask.java
deleted file mode 100644
index a499c61..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UninstallSubsystemTask.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import org.apache.sling.installer.api.tasks.ChangeStateTask;
-import org.apache.sling.installer.api.tasks.InstallTask;
-import org.apache.sling.installer.api.tasks.InstallationContext;
-import org.apache.sling.installer.api.tasks.ResourceState;
-import org.apache.sling.installer.api.tasks.TaskResource;
-import org.apache.sling.installer.api.tasks.TaskResourceGroup;
-import org.osgi.framework.BundleContext;
-import org.osgi.framework.ServiceReference;
-import org.osgi.service.subsystem.Subsystem;
-
-/**
- * Uninstall a subsystem
- */
-public class UninstallSubsystemTask extends InstallTask {
-
-    private static final String INSTALL_ORDER = "52-";
-
-    private final ServiceReference<Subsystem> subsystemReference;
-
-    private final BundleContext bundleContext;
-
-    public UninstallSubsystemTask(final TaskResourceGroup grp,
-            final BundleContext bundleContext,
-            final ServiceReference<Subsystem> ref) {
-        super(grp);
-        this.bundleContext = bundleContext;
-        this.subsystemReference = ref;
-    }
-
-    @Override
-    public void execute(final InstallationContext ctx) {
-        final TaskResource tr = this.getResource();
-        ctx.log("Uninstalling subsystem from {}", tr);
-
-        Subsystem subsystem = null;
-        try {
-            subsystem = this.bundleContext.getService(this.subsystemReference);
-            if ( subsystem != null ) {
-                subsystem.uninstall();
-                ctx.addTaskToCurrentCycle(new ChangeStateTask(this.getResourceGroup(), ResourceState.UNINSTALLED));
-                ctx.log("Uninstalled subsystem {}", subsystem);
-            } else {
-                ctx.log("Unable to uninstall subsystem {}.", tr);
-                ctx.addTaskToCurrentCycle(new ChangeStateTask(this.getResourceGroup(), ResourceState.IGNORED));
-            }
-        } finally {
-            if ( subsystem != null ) {
-                this.bundleContext.ungetService(this.subsystemReference);
-            }
-        }
-    }
-
-    @Override
-    public String getSortKey() {
-        return INSTALL_ORDER + getResource().getURL();
-    }
-}
diff --git a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UpdateSubsystemTask.java b/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UpdateSubsystemTask.java
deleted file mode 100644
index 781fcee..0000000
--- a/src/main/java/org/apache/sling/installer/factories/subsystems/impl/UpdateSubsystemTask.java
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.sling.installer.factories.subsystems.impl;
-
-import org.apache.sling.installer.api.tasks.ChangeStateTask;
-import org.apache.sling.installer.api.tasks.InstallTask;
-import org.apache.sling.installer.api.tasks.InstallationContext;
-import org.apache.sling.installer.api.tasks.ResourceState;
-import org.apache.sling.installer.api.tasks.TaskResource;
-import org.apache.sling.installer.api.tasks.TaskResourceGroup;
-import org.osgi.framework.BundleContext;
-import org.osgi.framework.ServiceReference;
-import org.osgi.service.subsystem.Subsystem;
-
-/**
- * Update subsystem by uninstalling and installing it.
- */
-public class UpdateSubsystemTask extends InstallTask {
-
-    private static final String INSTALL_ORDER = "54-";
-
-    private final Subsystem rootSubsystem;
-
-    private final ServiceReference<Subsystem> subsystemReference;
-
-    private final BundleContext bundleContext;
-
-    public UpdateSubsystemTask(final TaskResourceGroup grp,
-            final BundleContext bundleContext,
-            final ServiceReference<Subsystem> ref,
-            final Subsystem rootSubsystem) {
-        super(grp);
-        this.bundleContext = bundleContext;
-        this.subsystemReference = ref;
-        this.rootSubsystem = rootSubsystem;
-    }
-
-    @Override
-    public void execute(final InstallationContext ctx) {
-        final TaskResource tr = this.getResource();
-        ctx.log("Updating subsystem from {}", tr);
-
-        Subsystem subsystem = null;
-        try {
-            subsystem = this.bundleContext.getService(this.subsystemReference);
-            if ( subsystem != null ) {
-                subsystem.stop();
-                subsystem.uninstall();
-                ctx.addTaskToCurrentCycle(new InstallSubsystemTask(this.getResourceGroup(), this.rootSubsystem));
-            } else {
-                ctx.log("Unable to update subsystem {}.", tr);
-                ctx.addTaskToCurrentCycle(new ChangeStateTask(this.getResourceGroup(), ResourceState.IGNORED));
-            }
-        } finally {
-            if ( subsystem != null ) {
-                this.bundleContext.ungetService(this.subsystemReference);
-            }
-        }
-    }
-
-    @Override
-    public String getSortKey() {
-        return INSTALL_ORDER + getResource().getURL();
-    }
-}