From 61376f81121b678e7e49a785b6fab28553efa450 Mon Sep 17 00:00:00 2001
From: Andreas Dangel <andreas.dangel@adangel.org>
Date: Sat, 7 Oct 2017 21:28:20 +0200
Subject: [PATCH] [core] add temporary support for maven debug output refs #650

---
 .../main/java/net/sourceforge/pmd/PMD.java    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/pmd-core/src/main/java/net/sourceforge/pmd/PMD.java b/pmd-core/src/main/java/net/sourceforge/pmd/PMD.java
index 7b477607e7..db91c9eed6 100644
--- a/pmd-core/src/main/java/net/sourceforge/pmd/PMD.java
+++ b/pmd-core/src/main/java/net/sourceforge/pmd/PMD.java
@@ -278,6 +278,19 @@ public class PMD {
         return context;
     }
 
+    // TODO: remove this, once the maven pmd plugin can report details of processing errors
+    private static ScopedLogHandlersManager enableLoggingMavenDebug() {
+        ScopedLogHandlersManager logHandlerManager = null;
+        String commandLine = System.getProperty("sun.java.command");
+        if (commandLine != null && commandLine.startsWith("org.codehaus.plexus.classworlds.launcher.Launcher")
+                && (commandLine.endsWith("-X") || commandLine.contains("-X "))) {
+            final Handler logHandler = new ConsoleLogHandler();
+            logHandlerManager = new ScopedLogHandlersManager(Level.FINE, logHandler);
+            LOG.setLevel(Level.FINE);
+        }
+        return logHandlerManager;
+    }
+
     /**
      * Run PMD on a list of files using multiple threads - if more than one is
      * available
@@ -296,6 +309,8 @@ public class PMD {
     public static void processFiles(final PMDConfiguration configuration, final RuleSetFactory ruleSetFactory,
             final List<DataSource> files, final RuleContext ctx, final List<Renderer> renderers) {
 
+        ScopedLogHandlersManager logHandlerManager = enableLoggingMavenDebug();
+
         sortFiles(configuration, files);
 
         // Make sure the cache is listening for analysis results
@@ -316,6 +331,11 @@ public class PMD {
 
         // Persist the analysis cache
         configuration.getAnalysisCache().persist();
+
+        // see enableLoggingMavenDebug above
+        if (logHandlerManager != null) {
+            logHandlerManager.close();
+        }
     }
 
     private static void sortFiles(final PMDConfiguration configuration, final List<DataSource> files) {