diff --git a/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/io/Logger.java b/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/io/Logger.java
index a903fd8..4a4c6ba 100644
--- a/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/io/Logger.java
+++ b/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/io/Logger.java
@@ -97,7 +97,7 @@ public class Logger {
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		PrintStream ps = new PrintStream(baos);
 
-		t.printStackTrace(ps);
+		LOGGER.log("context", t);
 		ps.close();
 		return baos.toString();
 	}
diff --git a/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/security/HiddenAccess.java b/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/security/HiddenAccess.java
index 184001c..d3837b8 100644
--- a/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/security/HiddenAccess.java
+++ b/代码/workspace_robo4/robocode.api/src/main/java/net/sf/robocode/security/HiddenAccess.java
@@ -110,7 +110,6 @@ public class HiddenAccess {
 				Logger.logError("Can't find robocode.core-1.x.jar module near to robocode.jar");
 				Logger.logError("Class path: " + System.getProperty("robocode.class.path", null));
 			}
-			System.exit(-1);
 		} catch (MalformedURLException e) {
 			Logger.logError(e);
 		} catch (MyException e) {
diff --git a/代码/workspace_robo4/robocode.api/src/main/java/robocode/Event.java b/代码/workspace_robo4/robocode.api/src/main/java/robocode/Event.java
index ccb128c..eb72787 100644
--- a/代码/workspace_robo4/robocode.api/src/main/java/robocode/Event.java
+++ b/代码/workspace_robo4/robocode.api/src/main/java/robocode/Event.java
@@ -61,6 +61,7 @@ public abstract class Event implements Comparable<Event>, Serializable {
 	 *         has a lower precedence, i.e. must be listed after the specified event.
 	 *         0 means that the precedence of the two events are equal.
 	 */
+	@Override
 	public int compareTo(Event event) {
 		// Compare the time difference which has precedence over priority.
 		int timeDiff = (int) (time - event.time);