adangel commented on code in PR #150:
URL: https://github.com/apache/maven-pmd-plugin/pull/150#discussion_r1629003414


##########
src/main/java/org/apache/maven/plugins/pmd/exec/PmdErrorMessageReporter.java:
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@@ -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've now done another approach: just let PMD log the errors and m-pmd-p 
fails the build with the message "There were ... errors while executing CPD". 
The actual errors (e.g. "Lexical error in file ...") have been already logged, 
so users just need to scroll up. This also means, that these errors are logged 
only once and we don't need a custom PmdErrorMessageReporter.
   
   > @adangel Do you think you could add a test which invokes the exception 
handling and we can see the log output and `throw` combined?
   
   I've added a test case, see CpdReportTest#testWithCpdErrors. It asserts that 
we get the main exception which fails the build as well as the actual errors 
appear in the log output.
   



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