diff --git a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GroovycOSProcessHandler.java b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GroovycOSProcessHandler.java
index 47b7fe58c4d9..bb43051223e1 100644
--- a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GroovycOSProcessHandler.java
+++ b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GroovycOSProcessHandler.java
@@ -58,7 +58,7 @@ public class GroovycOSProcessHandler extends BaseOSProcessHandler {
     super.notifyTextAvailable(text, outputType);
 
     if (LOG.isDebugEnabled()) {
-      LOG.debug("Received from groovyc: " + text);
+      LOG.debug("Received from groovyc " + outputType + ": " + text);
     }
 
     if (outputType == ProcessOutputTypes.SYSTEM) {
@@ -197,14 +197,17 @@ public class GroovycOSProcessHandler extends BaseOSProcessHandler {
 
   public boolean shouldRetry() {
     if (getProcess().exitValue() != 0) {
+      LOG.debug("Non-zero exit code");
       return true;
     }
     for (CompilerMessage message : compilerMessages) {
       if (message.getKind() == BuildMessage.Kind.ERROR) {
+        LOG.debug("Error message: " + message);
         return true;
       }
     }
     if (getStdErr().length() > 0) {
+      LOG.debug("Non-empty stderr: '" + getStdErr() + "'");
       return true;
     }
     return false;