src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java - maven-compiler-plugin - Git at Google

 /*
  * 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.maven.plugin.compiler;

 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;

 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.plugins.annotations.ResolutionScope;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.shared.utils.StringUtils;
 import org.apache.maven.shared.utils.logging.MessageUtils;
 import org.apache.maven.toolchain.Toolchain;
 import org.apache.maven.toolchain.java.DefaultJavaToolChain;
 import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
 import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
 import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
 import org.codehaus.plexus.languages.java.jpms.JavaModuleDescriptor;
 import org.codehaus.plexus.languages.java.jpms.LocationManager;
 import org.codehaus.plexus.languages.java.jpms.ModuleNameSource;
 import org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest;
 import org.codehaus.plexus.languages.java.jpms.ResolvePathsResult;

 /**
  * Compiles application sources.
  * By default uses the <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac</a> compiler
  * of the JDK used to execute Maven. This can be overwritten through <a href="https://maven.apache.org/guides/mini/guide-using-toolchains.html">Toolchains</a>
  * or parameter {@link AbstractCompilerMojo#compilerId}.
  *
  * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
  * @since 2.0
  * @see <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac Command</a>
  */
 @Mojo(
         name = "compile",
         defaultPhase = LifecyclePhase.COMPILE,
         threadSafe = true,
         requiresDependencyResolution = ResolutionScope.COMPILE)
 public class CompilerMojo extends AbstractCompilerMojo {
     /**
      * The source directories containing the sources to be compiled.
      */
     @Parameter(defaultValue = "${project.compileSourceRoots}", readonly = false, required = true)
     private List<String> compileSourceRoots;

     /**
      * The directory for compiled classes.
      * <p>
      * This parameter should only be modified in special cases. One example is creating
      * a multi-release jar with a lower bytecode level (i.e. setting it to
      * {@code ${project.build.outputDirectory}/META-INF/versions/21} or similar) in an additional
      * execution.
      * <p>
      * When the required bytecode level is available though an installed JDK or toolchain,
      * it is recommended to use the {@code <release>} property
      * in conjunction with the ${multiReleaseOutput} parameter instead.
      */
     @Parameter(
             property = "maven.compiler.outputDirectory",
             defaultValue = "${project.build.outputDirectory}",
             required = true,
             readonly = false)
     private File outputDirectory;

     /**
      * Projects main artifact.
      *
      * @todo this is an export variable, really
      */
     @Parameter(defaultValue = "${project.artifact}", readonly = true, required = true)
     private Artifact projectArtifact;

     /**
      * A list of inclusion filters for the compiler.
      */
     @Parameter
     private Set<String> includes = new HashSet<>();

     /**
      * A list of exclusion filters for the compiler.
      */
     @Parameter
     private Set<String> excludes = new HashSet<>();

     /**
      * A list of exclusion filters for the incremental calculation.
      * @since 3.11
      */
     @Parameter
     private Set<String> incrementalExcludes = new HashSet<>();

     /**
      * Specify where to place generated source files created by annotation processing. Only applies to JDK 1.6+
      *
      * @since 2.2
      */
     @Parameter(defaultValue = "${project.build.directory}/generated-sources/annotations")
     private File generatedSourcesDirectory;

     /**
      * Set this to {@code true} to bypass compilation of main sources. Its use is NOT RECOMMENDED, but quite convenient on
      * occasion.
      */
     @Parameter(property = "maven.main.skip")
     private boolean skipMain;

     @Parameter(defaultValue = "${project.compileClasspathElements}", readonly = true, required = true)
     private List<String> compilePath;

     /**
      * <p>
      * When set to {@code true}, the classes will be placed in <code>META-INF/versions/${release}</code> The release
      * value must be set, otherwise the plugin will fail.
      * </p>
      * <strong>Note: </strong> A jar is only a multirelease jar if <code>META-INF/MANIFEST.MF</code> contains
      * <code>Multi-Release: true</code>. You need to set this by configuring the <a href=
      * "https://maven.apache.org/plugins/maven-jar-plugin/examples/manifest-customization.html">maven-jar-plugin</a>.
      * This implies that you cannot test a multirelease jar using the outputDirectory.
      *
      * @since 3.7.1
      */
     @Parameter
     private boolean multiReleaseOutput;

     /**
      * When both {@link AbstractCompilerMojo#fork} and {@link AbstractCompilerMojo#debug} are enabled the commandline arguments used
      * will be dumped to this file.
      * @since 3.10.0
      */
     @Parameter(defaultValue = "javac")
     private String debugFileName;

     final LocationManager locationManager = new LocationManager();

     private List<String> classpathElements;

     private List<String> modulepathElements;

     private Map<String, JavaModuleDescriptor> pathElements;

     @Override
     protected List<String> getCompileSourceRoots() {
         return compileSourceRoots;
     }

     @Override
     protected List<String> getClasspathElements() {
         return classpathElements;
     }

     @Override
     protected List<String> getModulepathElements() {
         return modulepathElements;
     }

     @Override
     protected Map<String, JavaModuleDescriptor> getPathElements() {
         return pathElements;
     }

     @Override
     protected File getOutputDirectory() {
         File dir;
         if (!multiReleaseOutput) {
             dir = outputDirectory;
         } else {
             dir = new File(outputDirectory, "META-INF/versions/" + release);
         }
         return dir;
     }

     @Override
     public void execute() throws MojoExecutionException, CompilationFailureException {
         if (skipMain) {
             getLog().info("Not compiling main sources");
             return;
         }

         if (multiReleaseOutput && release == null) {
             throw new MojoExecutionException("When using 'multiReleaseOutput' the release must be set");
         }

         super.execute();

         if (outputDirectory.isDirectory()) {
             File artifactFile = projectArtifact.getFile();
             if (artifactFile != null && !Objects.equals(artifactFile, outputDirectory)) {
                 getLog().warn("Overwriting artifact's file from " + artifactFile + " to " + outputDirectory);
             }
             projectArtifact.setFile(outputDirectory);
         }
     }

     @Override
     protected Set<String> getIncludes() {
         return includes;
     }

     @Override
     protected Set<String> getExcludes() {
         return excludes;
     }

     @Override
     protected void preparePaths(Set<File> sourceFiles) {
         // assert compilePath != null;

         Optional<Path> moduleDeclaration = getModuleDeclaration(sourceFiles);

         if (moduleDeclaration.isPresent()) {
             // For now only allow named modules. Once we can create a graph with ASM we can specify exactly the modules
             // and we can detect if auto modules are used. In that case, MavenProject.setFile() should not be used, so
             // you cannot depend on this project and so it won't be distributed.

             modulepathElements = new ArrayList<>(compilePath.size());
             classpathElements = new ArrayList<>(compilePath.size());
             pathElements = new LinkedHashMap<>(compilePath.size());

             ResolvePathsResult<File> resolvePathsResult;
             try {
                 Collection<File> dependencyArtifacts = getCompileClasspathElements(getProject());

                 ResolvePathsRequest<File> request = ResolvePathsRequest.ofFiles(dependencyArtifacts)
                         .setIncludeStatic(true)
                         .setMainModuleDescriptor(moduleDeclaration.get().toFile());

                 Toolchain toolchain = getToolchain();
                 if (toolchain instanceof DefaultJavaToolChain) {
                     request.setJdkHome(new File(((DefaultJavaToolChain) toolchain).getJavaHome()));
                 }

                 resolvePathsResult = locationManager.resolvePaths(request);

                 for (Entry<File, Exception> pathException :
                         resolvePathsResult.getPathExceptions().entrySet()) {
                     Throwable cause = pathException.getValue();
                     while (cause.getCause() != null) {
                         cause = cause.getCause();
                     }
                     String fileName = pathException.getKey().getName();
                     getLog().warn("Can't extract module name from " + fileName + ": " + cause.getMessage());
                 }

                 JavaModuleDescriptor moduleDescriptor = resolvePathsResult.getMainModuleDescriptor();

                 detectFilenameBasedAutomodules(resolvePathsResult, moduleDescriptor);

                 for (Map.Entry<File, JavaModuleDescriptor> entry :
                         resolvePathsResult.getPathElements().entrySet()) {
                     pathElements.put(entry.getKey().getPath(), entry.getValue());
                 }

                 if (compilerArgs == null) {
                     compilerArgs = new ArrayList<>();
                 }

                 for (File file : resolvePathsResult.getClasspathElements()) {
                     classpathElements.add(file.getPath());

                     if (multiReleaseOutput) {
                         if (getOutputDirectory().toPath().startsWith(file.getPath())) {
                             compilerArgs.add("--patch-module");
                             compilerArgs.add(String.format("%s=%s", moduleDescriptor.name(), file.getPath()));
                         }
                     }
                 }

                 for (File file : resolvePathsResult.getModulepathElements().keySet()) {
                     modulepathElements.add(file.getPath());
                 }

                 compilerArgs.add("--module-version");
                 compilerArgs.add(getProject().getVersion());

             } catch (IOException e) {
                 getLog().warn(e.getMessage());
             }
         } else {
             classpathElements = new ArrayList<>();
             for (File element : getCompileClasspathElements(getProject())) {
                 classpathElements.add(element.getPath());
             }
             modulepathElements = Collections.emptyList();
             pathElements = Collections.emptyMap();
         }
     }

     private void detectFilenameBasedAutomodules(
             final ResolvePathsResult<File> resolvePathsResult, final JavaModuleDescriptor moduleDescriptor) {
         List<String> automodulesDetected = new ArrayList<>();
         for (Entry<File, ModuleNameSource> entry :
                 resolvePathsResult.getModulepathElements().entrySet()) {
             if (ModuleNameSource.FILENAME.equals(entry.getValue())) {
                 automodulesDetected.add(entry.getKey().getName());
             }
         }

         if (!automodulesDetected.isEmpty()) {
             final String message = "Required filename-based automodules detected: "
                     + automodulesDetected + ". "
                     + "Please don't publish this project to a public artifact repository!";

             if (moduleDescriptor.exports().isEmpty()) {
                 // application
                 getLog().info(message);
             } else {
                 // library
                 writeBoxedWarning(message);
             }
         }
     }

     private List<File> getCompileClasspathElements(MavenProject project) {
         // 3 is outputFolder + 2 preserved for multirelease
         List<File> list = new ArrayList<>(project.getArtifacts().size() + 3);

         if (multiReleaseOutput) {
             File versionsFolder = new File(project.getBuild().getOutputDirectory(), "META-INF/versions");

             // in reverse order
             for (int version = Integer.parseInt(getRelease()) - 1; version >= 9; version--) {
                 File versionSubFolder = new File(versionsFolder, String.valueOf(version));
                 if (versionSubFolder.exists()) {
                     list.add(versionSubFolder);
                 }
             }
         }

         list.add(new File(project.getBuild().getOutputDirectory()));

         for (Artifact a : project.getArtifacts()) {
             if (a.getArtifactHandler().isAddedToClasspath()) {
                 list.add(a.getFile());
             }
         }
         return list;
     }

     @Override
     protected SourceInclusionScanner getSourceInclusionScanner(int staleMillis) {
         if (includes.isEmpty() && excludes.isEmpty() && incrementalExcludes.isEmpty()) {
             return new StaleSourceScanner(staleMillis);
         }

         if (includes.isEmpty()) {
             includes.add("**/*.java");
         }

         Set<String> excludesIncr = new HashSet<>(excludes);
         excludesIncr.addAll(this.incrementalExcludes);
         return new StaleSourceScanner(staleMillis, includes, excludesIncr);
     }

     @Override
     protected SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding) {
         // it's not defined if we get the ending with or without the dot '.'
         String defaultIncludePattern = "**/*" + (inputFileEnding.startsWith(".") ? "" : ".") + inputFileEnding;

         if (includes.isEmpty()) {
             includes.add(defaultIncludePattern);
         }
         Set<String> excludesIncr = new HashSet<>(excludes);
         excludesIncr.addAll(excludesIncr);
         return new SimpleSourceInclusionScanner(includes, excludesIncr);
     }

     @Override
     protected String getSource() {
         return source;
     }

     @Override
     protected String getTarget() {
         return target;
     }

     @Override
     protected String getRelease() {
         return release;
     }

     @Override
     protected String getCompilerArgument() {
         return compilerArgument;
     }

     @Override
     protected Map<String, String> getCompilerArguments() {
         return compilerArguments;
     }

     @Override
     protected File getGeneratedSourcesDirectory() {
         return generatedSourcesDirectory;
     }

     @Override
     protected String getDebugFileName() {
         return debugFileName;
     }

     private void writeBoxedWarning(String message) {
         String line = StringUtils.repeat("*", message.length() + 4);
         getLog().warn(line);
         getLog().warn("* " + MessageUtils.buffer().strong(message) + " *");
         getLog().warn(line);
     }
 }
	/*
	* 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.maven.plugin.compiler;

	import java.io.File;
	import java.io.IOException;
	import java.nio.file.Path;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.Map.Entry;
	import java.util.Objects;
	import java.util.Optional;
	import java.util.Set;

	import org.apache.maven.artifact.Artifact;
	import org.apache.maven.plugin.MojoExecutionException;
	import org.apache.maven.plugins.annotations.LifecyclePhase;
	import org.apache.maven.plugins.annotations.Mojo;
	import org.apache.maven.plugins.annotations.Parameter;
	import org.apache.maven.plugins.annotations.ResolutionScope;
	import org.apache.maven.project.MavenProject;
	import org.apache.maven.shared.utils.StringUtils;
	import org.apache.maven.shared.utils.logging.MessageUtils;
	import org.apache.maven.toolchain.Toolchain;
	import org.apache.maven.toolchain.java.DefaultJavaToolChain;
	import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
	import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
	import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
	import org.codehaus.plexus.languages.java.jpms.JavaModuleDescriptor;
	import org.codehaus.plexus.languages.java.jpms.LocationManager;
	import org.codehaus.plexus.languages.java.jpms.ModuleNameSource;
	import org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest;
	import org.codehaus.plexus.languages.java.jpms.ResolvePathsResult;

	/**
	* Compiles application sources.
	* By default uses the <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac</a> compiler
	* of the JDK used to execute Maven. This can be overwritten through <a href="https://maven.apache.org/guides/mini/guide-using-toolchains.html">Toolchains</a>
	* or parameter {@link AbstractCompilerMojo#compilerId}.
	*
	* @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
	* @since 2.0
	* @see <a href="https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html">javac Command</a>
	*/
	@Mojo(
	name = "compile",
	defaultPhase = LifecyclePhase.COMPILE,
	threadSafe = true,
	requiresDependencyResolution = ResolutionScope.COMPILE)
	public class CompilerMojo extends AbstractCompilerMojo {
	/**
	* The source directories containing the sources to be compiled.
	*/
	@Parameter(defaultValue = "${project.compileSourceRoots}", readonly = false, required = true)
	private List<String> compileSourceRoots;

	/**
	* The directory for compiled classes.
	* <p>
	* This parameter should only be modified in special cases. One example is creating
	* a multi-release jar with a lower bytecode level (i.e. setting it to
	* {@code ${project.build.outputDirectory}/META-INF/versions/21} or similar) in an additional
	* execution.
	* <p>
	* When the required bytecode level is available though an installed JDK or toolchain,
	* it is recommended to use the {@code <release>} property
	* in conjunction with the ${multiReleaseOutput} parameter instead.
	*/
	@Parameter(
	property = "maven.compiler.outputDirectory",
	defaultValue = "${project.build.outputDirectory}",
	required = true,
	readonly = false)
	private File outputDirectory;

	/**
	* Projects main artifact.
	*
	* @todo this is an export variable, really
	*/
	@Parameter(defaultValue = "${project.artifact}", readonly = true, required = true)
	private Artifact projectArtifact;

	/**
	* A list of inclusion filters for the compiler.
	*/
	@Parameter
	private Set<String> includes = new HashSet<>();

	/**
	* A list of exclusion filters for the compiler.
	*/
	@Parameter
	private Set<String> excludes = new HashSet<>();

	/**
	* A list of exclusion filters for the incremental calculation.
	* @since 3.11
	*/
	@Parameter
	private Set<String> incrementalExcludes = new HashSet<>();

	/**
	* Specify where to place generated source files created by annotation processing. Only applies to JDK 1.6+
	*
	* @since 2.2
	*/
	@Parameter(defaultValue = "${project.build.directory}/generated-sources/annotations")
	private File generatedSourcesDirectory;

	/**
	* Set this to {@code true} to bypass compilation of main sources. Its use is NOT RECOMMENDED, but quite convenient on
	* occasion.
	*/
	@Parameter(property = "maven.main.skip")
	private boolean skipMain;

	@Parameter(defaultValue = "${project.compileClasspathElements}", readonly = true, required = true)
	private List<String> compilePath;

	/**
	* <p>
	* When set to {@code true}, the classes will be placed in <code>META-INF/versions/${release}</code> The release
	* value must be set, otherwise the plugin will fail.
	* </p>
	* <strong>Note: </strong> A jar is only a multirelease jar if <code>META-INF/MANIFEST.MF</code> contains
	* <code>Multi-Release: true</code>. You need to set this by configuring the <a href=
	* "https://maven.apache.org/plugins/maven-jar-plugin/examples/manifest-customization.html">maven-jar-plugin</a>.
	* This implies that you cannot test a multirelease jar using the outputDirectory.
	*
	* @since 3.7.1
	*/
	@Parameter
	private boolean multiReleaseOutput;

	/**
	* When both {@link AbstractCompilerMojo#fork} and {@link AbstractCompilerMojo#debug} are enabled the commandline arguments used
	* will be dumped to this file.
	* @since 3.10.0
	*/
	@Parameter(defaultValue = "javac")
	private String debugFileName;

	final LocationManager locationManager = new LocationManager();

	private List<String> classpathElements;

	private List<String> modulepathElements;

	private Map<String, JavaModuleDescriptor> pathElements;

	@Override
	protected List<String> getCompileSourceRoots() {
	return compileSourceRoots;
	}

	@Override
	protected List<String> getClasspathElements() {
	return classpathElements;
	}

	@Override
	protected List<String> getModulepathElements() {
	return modulepathElements;
	}

	@Override
	protected Map<String, JavaModuleDescriptor> getPathElements() {
	return pathElements;
	}

	@Override
	protected File getOutputDirectory() {
	File dir;
	if (!multiReleaseOutput) {
	dir = outputDirectory;
	} else {
	dir = new File(outputDirectory, "META-INF/versions/" + release);
	}
	return dir;
	}

	@Override
	public void execute() throws MojoExecutionException, CompilationFailureException {
	if (skipMain) {
	getLog().info("Not compiling main sources");
	return;
	}

	if (multiReleaseOutput && release == null) {
	throw new MojoExecutionException("When using 'multiReleaseOutput' the release must be set");
	}

	super.execute();

	if (outputDirectory.isDirectory()) {
	File artifactFile = projectArtifact.getFile();
	if (artifactFile != null && !Objects.equals(artifactFile, outputDirectory)) {
	getLog().warn("Overwriting artifact's file from " + artifactFile + " to " + outputDirectory);
	}
	projectArtifact.setFile(outputDirectory);
	}
	}

	@Override
	protected Set<String> getIncludes() {
	return includes;
	}

	@Override
	protected Set<String> getExcludes() {
	return excludes;
	}

	@Override
	protected void preparePaths(Set<File> sourceFiles) {
	// assert compilePath != null;

	Optional<Path> moduleDeclaration = getModuleDeclaration(sourceFiles);

	if (moduleDeclaration.isPresent()) {
	// For now only allow named modules. Once we can create a graph with ASM we can specify exactly the modules
	// and we can detect if auto modules are used. In that case, MavenProject.setFile() should not be used, so
	// you cannot depend on this project and so it won't be distributed.

	modulepathElements = new ArrayList<>(compilePath.size());
	classpathElements = new ArrayList<>(compilePath.size());
	pathElements = new LinkedHashMap<>(compilePath.size());

	ResolvePathsResult<File> resolvePathsResult;
	try {
	Collection<File> dependencyArtifacts = getCompileClasspathElements(getProject());

	ResolvePathsRequest<File> request = ResolvePathsRequest.ofFiles(dependencyArtifacts)
	.setIncludeStatic(true)
	.setMainModuleDescriptor(moduleDeclaration.get().toFile());

	Toolchain toolchain = getToolchain();
	if (toolchain instanceof DefaultJavaToolChain) {
	request.setJdkHome(new File(((DefaultJavaToolChain) toolchain).getJavaHome()));
	}

	resolvePathsResult = locationManager.resolvePaths(request);

	for (Entry<File, Exception> pathException :
	resolvePathsResult.getPathExceptions().entrySet()) {
	Throwable cause = pathException.getValue();
	while (cause.getCause() != null) {
	cause = cause.getCause();
	}
	String fileName = pathException.getKey().getName();
	getLog().warn("Can't extract module name from " + fileName + ": " + cause.getMessage());
	}

	JavaModuleDescriptor moduleDescriptor = resolvePathsResult.getMainModuleDescriptor();

	detectFilenameBasedAutomodules(resolvePathsResult, moduleDescriptor);

	for (Map.Entry<File, JavaModuleDescriptor> entry :
	resolvePathsResult.getPathElements().entrySet()) {
	pathElements.put(entry.getKey().getPath(), entry.getValue());
	}

	if (compilerArgs == null) {
	compilerArgs = new ArrayList<>();
	}

	for (File file : resolvePathsResult.getClasspathElements()) {
	classpathElements.add(file.getPath());

	if (multiReleaseOutput) {
	if (getOutputDirectory().toPath().startsWith(file.getPath())) {
	compilerArgs.add("--patch-module");
	compilerArgs.add(String.format("%s=%s", moduleDescriptor.name(), file.getPath()));
	}
	}
	}

	for (File file : resolvePathsResult.getModulepathElements().keySet()) {
	modulepathElements.add(file.getPath());
	}

	compilerArgs.add("--module-version");
	compilerArgs.add(getProject().getVersion());

	} catch (IOException e) {
	getLog().warn(e.getMessage());
	}
	} else {
	classpathElements = new ArrayList<>();
	for (File element : getCompileClasspathElements(getProject())) {
	classpathElements.add(element.getPath());
	}
	modulepathElements = Collections.emptyList();
	pathElements = Collections.emptyMap();
	}
	}

	private void detectFilenameBasedAutomodules(
	final ResolvePathsResult<File> resolvePathsResult, final JavaModuleDescriptor moduleDescriptor) {
	List<String> automodulesDetected = new ArrayList<>();
	for (Entry<File, ModuleNameSource> entry :
	resolvePathsResult.getModulepathElements().entrySet()) {
	if (ModuleNameSource.FILENAME.equals(entry.getValue())) {
	automodulesDetected.add(entry.getKey().getName());
	}
	}

	if (!automodulesDetected.isEmpty()) {
	final String message = "Required filename-based automodules detected: "
	+ automodulesDetected + ". "
	+ "Please don't publish this project to a public artifact repository!";

	if (moduleDescriptor.exports().isEmpty()) {
	// application
	getLog().info(message);
	} else {
	// library
	writeBoxedWarning(message);
	}
	}
	}

	private List<File> getCompileClasspathElements(MavenProject project) {
	// 3 is outputFolder + 2 preserved for multirelease
	List<File> list = new ArrayList<>(project.getArtifacts().size() + 3);

	if (multiReleaseOutput) {
	File versionsFolder = new File(project.getBuild().getOutputDirectory(), "META-INF/versions");

	// in reverse order
	for (int version = Integer.parseInt(getRelease()) - 1; version >= 9; version--) {
	File versionSubFolder = new File(versionsFolder, String.valueOf(version));
	if (versionSubFolder.exists()) {
	list.add(versionSubFolder);
	}
	}
	}

	list.add(new File(project.getBuild().getOutputDirectory()));

	for (Artifact a : project.getArtifacts()) {
	if (a.getArtifactHandler().isAddedToClasspath()) {
	list.add(a.getFile());
	}
	}
	return list;
	}

	@Override
	protected SourceInclusionScanner getSourceInclusionScanner(int staleMillis) {
	if (includes.isEmpty() && excludes.isEmpty() && incrementalExcludes.isEmpty()) {
	return new StaleSourceScanner(staleMillis);
	}

	if (includes.isEmpty()) {
	includes.add("*/.java");
	}

	Set<String> excludesIncr = new HashSet<>(excludes);
	excludesIncr.addAll(this.incrementalExcludes);
	return new StaleSourceScanner(staleMillis, includes, excludesIncr);
	}

	@Override
	protected SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding) {
	// it's not defined if we get the ending with or without the dot '.'
	String defaultIncludePattern = "*/" + (inputFileEnding.startsWith(".") ? "" : ".") + inputFileEnding;

	if (includes.isEmpty()) {
	includes.add(defaultIncludePattern);
	}
	Set<String> excludesIncr = new HashSet<>(excludes);
	excludesIncr.addAll(excludesIncr);
	return new SimpleSourceInclusionScanner(includes, excludesIncr);
	}

	@Override
	protected String getSource() {
	return source;
	}

	@Override
	protected String getTarget() {
	return target;
	}

	@Override
	protected String getRelease() {
	return release;
	}

	@Override
	protected String getCompilerArgument() {
	return compilerArgument;
	}

	@Override
	protected Map<String, String> getCompilerArguments() {
	return compilerArguments;
	}

	@Override
	protected File getGeneratedSourcesDirectory() {
	return generatedSourcesDirectory;
	}

	@Override
	protected String getDebugFileName() {
	return debugFileName;
	}

	private void writeBoxedWarning(String message) {
	String line = StringUtils.repeat("*", message.length() + 4);
	getLog().warn(line);
	getLog().warn("* " + MessageUtils.buffer().strong(message) + " *");
	getLog().warn(line);
	}
	}