diff --git a/CHANGES.md b/CHANGES.md
index 91c2f77b69b72a6e66318b49d8e54d70ec03d83f..589d5a20131f30e808b5e236c9de68f44b25f021 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -9,8 +9,8 @@ Release Notes.
 
 #### Java Agent
 * Remove invalid mysql configuration in agent.config.
-* Add net.bytebuddy.agent.builder.AgentBuilder.RedefinitionStrategy.Listener to show detail message when redefine errors occur
-
+* Add net.bytebuddy.agent.builder.AgentBuilder.RedefinitionStrategy.Listener to show detail message when redefine errors occur.
+* Fix ClassCastException of log4j gRPC reporter.
 
 #### OAP-Backend
 * Allow user-defined `JAVA_OPTS` in the startup script.
diff --git a/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/pom.xml b/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/pom.xml
index 3028977429d9b90b248091ea188b8f2564d833ec..e5f2e138753731ca6892a249c2d00c72b94fc6d6 100644
--- a/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/pom.xml
+++ b/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/pom.xml
@@ -36,7 +36,7 @@
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
             <version>${log4j.version}</version>
-            <scope>test</scope>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.apache.skywalking</groupId>
diff --git a/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/src/main/java/org/apache/skywalking/apm/toolkit/activation/log/log4j/v1/x/log/GRPCLogAppenderInterceptor.java b/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/src/main/java/org/apache/skywalking/apm/toolkit/activation/log/log4j/v1/x/log/GRPCLogAppenderInterceptor.java
index c78198467c402e5a0b2f1df2a6268b67db52fc92..98c555ce0c5ff0449d4ce8879d7a1a86ab83d990 100644
--- a/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/src/main/java/org/apache/skywalking/apm/toolkit/activation/log/log4j/v1/x/log/GRPCLogAppenderInterceptor.java
+++ b/apm-sniffer/apm-toolkit-activation/apm-toolkit-log4j-1.x-activation/src/main/java/org/apache/skywalking/apm/toolkit/activation/log/log4j/v1/x/log/GRPCLogAppenderInterceptor.java
@@ -35,7 +35,7 @@ import org.apache.skywalking.apm.network.logging.v3.LogDataBody;
 import org.apache.skywalking.apm.network.logging.v3.LogTags;
 import org.apache.skywalking.apm.network.logging.v3.TextLog;
 import org.apache.skywalking.apm.network.logging.v3.TraceContext;
-import org.slf4j.event.LoggingEvent;
+import org.apache.log4j.spi.LoggingEvent;
 
 public class GRPCLogAppenderInterceptor implements InstanceMethodsAroundInterceptor {
 
@@ -103,6 +103,8 @@ public class GRPCLogAppenderInterceptor implements InstanceMethodsAroundIntercep
     }
 
     private String transformLogText(final LoggingEvent event) {
-        return event.getMessage() + "\n" + ThrowableTransformer.INSTANCE.convert2String(event.getThrowable(), 2048);
+        final String throwableString = Objects.isNull(event.getThrowableInformation()) ? "" : 
+            ThrowableTransformer.INSTANCE.convert2String(event.getThrowableInformation().getThrowable(), 2048);
+        return event.getMessage() + "\n" + throwableString;
     }
 }