diff --git a/src/main/java/org/nlpcn/jcoder/run/java/DynamicEngine.java b/src/main/java/org/nlpcn/jcoder/run/java/DynamicEngine.java
index 2be6475..df01fc8 100644
--- a/src/main/java/org/nlpcn/jcoder/run/java/DynamicEngine.java
+++ b/src/main/java/org/nlpcn/jcoder/run/java/DynamicEngine.java
@@ -3,6 +3,7 @@
 import com.google.common.base.Joiner;
 import org.nlpcn.jcoder.run.CodeException;
 import org.nlpcn.jcoder.scheduler.TaskException;
+import org.nlpcn.jcoder.util.StaticValue;
 import org.nlpcn.jcoder.util.StringUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -89,6 +90,9 @@ public Class<?> javaCodeToClass(String fullClassName, String javaCode) throws IO
 		options.add("-classpath");
 		options.add(this.classpath);
 		options.add("-parameters");
+        if (StaticValue.TESTRING) {
+            options.add("-g");
+        }
 
 		JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, options, null, jfiles);
 		boolean success = task.call();