diff --git a/src/main/java/org/apache/maven/plugins/pmd/PmdCollectingRenderer.java b/src/main/java/org/apache/maven/plugins/pmd/PmdCollectingRenderer.java
deleted file mode 100644
index 1fd8645..0000000
--- a/src/main/java/org/apache/maven/plugins/pmd/PmdCollectingRenderer.java
+++ /dev/null
@@ -1,150 +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.maven.plugins.pmd;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import net.sourceforge.pmd.Report;
-import net.sourceforge.pmd.Report.ProcessingError;
-import net.sourceforge.pmd.Report.SuppressedViolation;
-import net.sourceforge.pmd.RuleViolation;
-import net.sourceforge.pmd.renderers.AbstractRenderer;
-import net.sourceforge.pmd.util.datasource.DataSource;
-import org.codehaus.plexus.util.StringUtils;
-
-/**
- * A PMD renderer, that collects all violations and processing errors
- * from a pmd execution.
- *
- * @author Andreas Dangel
- * @deprecated not used anymore
- */
-@Deprecated
-public class PmdCollectingRenderer extends AbstractRenderer {
-    private List<ProcessingError> errors = Collections.synchronizedList(new ArrayList<>());
-    private List<RuleViolation> violations = Collections.synchronizedList(new ArrayList<>());
-    private List<SuppressedViolation> suppressed = Collections.synchronizedList(new ArrayList<>());
-
-    /**
-     * Collects all reports from all threads.
-     */
-    public PmdCollectingRenderer() {
-        super(PmdCollectingRenderer.class.getSimpleName(), "Collects all reports from all threads");
-    }
-
-    @Override
-    public void renderFileReport(Report report) throws IOException {
-        violations.addAll(report.getViolations());
-        errors.addAll(report.getProcessingErrors());
-        suppressed.addAll(report.getSuppressedViolations());
-    }
-
-    /**
-     * Checks whether any violations have been found.
-     * @return <code>true</code> if at least one violations has been found
-     */
-    public boolean hasViolations() {
-        return !violations.isEmpty();
-    }
-
-    /**
-     * Gets the list of all found violations.
-     * @return the violations
-     */
-    public List<RuleViolation> getViolations() {
-        return violations;
-    }
-
-    /**
-     * Checks whether any processing errors have been found.
-     * @return <code>true</code> if any errors have been found
-     */
-    public boolean hasErrors() {
-        return !errors.isEmpty();
-    }
-
-    /**
-     * Gets all the processing errors.
-     * @return the errors
-     */
-    public List<ProcessingError> getErrors() {
-        return errors;
-    }
-
-    /**
-     * Gets the errors as a single string. Each error is in its own line.
-     * @param withDetails if <code>true</code> then add the error details additionally (contains e.g. the stacktrace)
-     * @return the errors as string
-     */
-    public String getErrorsAsString(boolean withDetails) {
-        List<String> errorsAsString = new ArrayList<>(errors.size());
-        for (ProcessingError error : errors) {
-            errorsAsString.add(error.getFile() + ": " + error.getMsg());
-            if (withDetails) {
-                errorsAsString.add(error.getDetail());
-            }
-        }
-        return StringUtils.join(errorsAsString.toArray(), System.getProperty("line.separator"));
-    }
-
-    /**
-     * Create a new single report with all violations for further rendering into other formats than HTML.
-     * @return the report
-     */
-    public Report asReport() {
-        Report report = new Report();
-        for (RuleViolation v : violations) {
-            report.addRuleViolation(v);
-        }
-        for (ProcessingError e : errors) {
-            report.addError(e);
-        }
-        Map<Integer, String> suppressedLines = new HashMap<Integer, String>();
-        for (SuppressedViolation s : suppressed) {
-            if (s.suppressedByNOPMD()) {
-                suppressedLines.put(s.getRuleViolation().getBeginLine(), s.getUserMessage());
-            }
-        }
-        report.suppress(suppressedLines);
-        for (SuppressedViolation s : suppressed) {
-            report.addRuleViolation(s.getRuleViolation());
-        }
-        return report;
-    }
-
-    // stubs need to fulfill the Renderer interface
-    @Override
-    public String defaultFileExtension() {
-        return null;
-    }
-
-    @Override
-    public void start() throws IOException {}
-
-    @Override
-    public void startFileAnalysis(DataSource dataSource) {}
-
-    @Override
-    public void end() throws IOException {}
-}