elharo commented on code in PR #150:
URL: https://github.com/apache/maven-pmd-plugin/pull/150#discussion_r1624576921


##########
src/main/java/org/apache/maven/plugins/pmd/exec/CpdReportConsumer.java:
##########
@@ -0,0 +1,119 @@
+/*
+ * 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.exec;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+
+import net.sourceforge.pmd.cpd.CPDReport;
+import net.sourceforge.pmd.cpd.CPDReportRenderer;
+import net.sourceforge.pmd.cpd.Match;
+import net.sourceforge.pmd.cpd.XMLRenderer;
+import org.apache.maven.plugins.pmd.ExcludeDuplicationsFromFile;
+import org.apache.maven.reporting.MavenReportException;
+import org.codehaus.plexus.util.FileUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class CpdReportConsumer implements Consumer<CPDReport> {
+    private static final Logger LOG = 
LoggerFactory.getLogger(CpdReportConsumer.class);
+
+    private final CpdRequest request;
+    private final ExcludeDuplicationsFromFile excludeDuplicationsFromFile;
+
+    CpdReportConsumer(CpdRequest request, ExcludeDuplicationsFromFile 
excludeDuplicationsFromFile) {
+        this.request = request;
+        this.excludeDuplicationsFromFile = excludeDuplicationsFromFile;
+    }
+
+    @Override
+    public void accept(CPDReport report) {
+        try {
+            // always create XML format. we need to output it even if the file 
list is empty or we have no
+            // duplications so that the "check" goals can check for violations
+            writeXmlReport(report);
+
+            // html format is handled by maven site report, xml format has 
already been rendered

Review Comment:
   HTML



##########
src/main/java/org/apache/maven/plugins/pmd/exec/PmdErrorMessageReporter.java:
##########
@@ -0,0 +1,80 @@
+/*
+ * 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.exec;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.sourceforge.pmd.util.log.PmdReporter;
+import org.apache.maven.reporting.MavenReportException;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.slf4j.event.Level;
+
+class PmdErrorMessageReporter implements PmdReporter {
+    private final PmdReporter delegate;
+    private List<Throwable> errors = new ArrayList<>();
+
+    PmdErrorMessageReporter(PmdReporter delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public boolean isLoggable(Level level) {
+        return delegate.isLoggable(level);
+    }
+
+    @Override
+    public void logEx(Level level, @Nullable String message, Object[] 
formatArgs, @Nullable Throwable error) {
+        if (error != null) {
+            if (error instanceof RuntimeException && error.getCause() 
instanceof MavenReportException) {
+                errors.add(error.getCause());
+            } else {
+                errors.add(error);
+            }
+        }
+
+        delegate.logEx(level, message, formatArgs, error);
+    }
+
+    @Override
+    public int numErrors() {
+        return delegate.numErrors();
+    }
+
+    public void rethrowErrorsAsMavenReportException() throws 
MavenReportException {
+        if (errors.isEmpty()) {
+            return;
+        }
+
+        final MavenReportException exception;
+
+        Throwable firstError = errors.get(0);

Review Comment:
   I'm not sure I see the confusion here. If I follow, multiple exceptions are 
thrown and stored while the process runs. When it's done a single exception is 
thrown, which is either the first exception or a wrapper around the first 
exception. The other exceptions are stored ion addSuppressed below, and should 
be visible in the eventual stack trace. Is that correct?



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