Support Gson Plugin (#2090)

* Support Gson plugin

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/ComponentsDefine.java

@@ -106,6 +106,8 @@ public class ComponentsDefine {
 
     public static final OfficialComponent CANAL = new OfficialComponent(54,"Canal");
 
+    public static final OfficialComponent GSON = new OfficialComponent(55,"Gson");
+
     private static ComponentsDefine INSTANCE = new ComponentsDefine();
 
     private String[] components;
@@ -115,7 +117,7 @@ public class ComponentsDefine {
     }
 
     public ComponentsDefine() {
-        components = new String[55];
+        components = new String[56];
         addComponent(TOMCAT);
         addComponent(HTTPCLIENT);
         addComponent(DUBBO);
@@ -155,6 +157,7 @@ public class ComponentsDefine {
         addComponent(RABBITMQ_PRODUCER);
         addComponent(RABBITMQ_CONSUMER);
         addComponent(CANAL);
+        addComponent(GSON);
     }
 
     private void addComponent(OfficialComponent component) {

apm-sniffer/apm-sdk-plugin/pom.xml

@@ -60,7 +60,7 @@
         <module>activemq-5.x-plugin</module>
         <module>elasticsearch-5.x-plugin</module>
         <module>undertow-plugins</module>
-	<module>rabbitmq-5.x-plugin</module>
+        <module>rabbitmq-5.x-plugin</module>
         <module>dubbo-conflict-patch</module>
         <module>canal-1.x-plugin</module>
     </modules>

apm-sniffer/optional-plugins/gson-2.8.x-plugin/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to You under the Apache License, Version 2.0
+  ~ (the "License"); you may not use this file except in compliance with
+  ~ the License.  You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.apache.skywalking</groupId>
+        <artifactId>optional-plugins</artifactId>
+        <version>6.0.0-GA-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>apm-gson-2.x-plugin</artifactId>
+    <name>gson-2.8.x-plugin</name>
+    <packaging>jar</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <gson.version>2.8.5</gson.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/gson/GsonFromJsonInterceptor.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson;
+
+import org.apache.skywalking.apm.agent.core.context.ContextManager;
+import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
+import org.apache.skywalking.apm.network.trace.component.ComponentsDefine;
+
+import java.lang.reflect.Method;
+
+
+/**
+ * @author withlin
+ */
+public class GsonFromJsonInterceptor implements InstanceMethodsAroundInterceptor {
+    @Override
+    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
+                             Class<?>[] argumentsTypes,
+                             MethodInterceptResult result) throws Throwable {
+
+        AbstractSpan span = ContextManager.createLocalSpan("Gson/FromJson");
+        span.setComponent(ComponentsDefine.GSON);
+        Integer length = allArguments[0].toString().length();
+        span.tag("length", length.toString());
+
+    }
+
+    @Override
+    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
+                              Class<?>[] argumentsTypes,
+                              Object ret) throws Throwable {
+        ContextManager.stopSpan();
+        return ret;
+
+    }
+
+    @Override
+    public void handleMethodException(EnhancedInstance objInst, Method method,
+                                      Object[] allArguments,
+                                      Class<?>[] argumentsTypes, Throwable t) {
+        ContextManager.activeSpan().errorOccurred().log(t);
+    }
+}
\ No newline at end of file

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/gson/GsonToJsonInterceptor.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson;
+
+import org.apache.skywalking.apm.agent.core.context.ContextManager;
+import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
+import org.apache.skywalking.apm.network.trace.component.ComponentsDefine;
+
+import java.lang.reflect.Method;
+
+/**
+ * @author withlin
+ */
+public class GsonToJsonInterceptor implements InstanceMethodsAroundInterceptor {
+    @Override
+    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
+                             Class<?>[] argumentsTypes,
+                             MethodInterceptResult result) throws Throwable {
+
+        AbstractSpan span = ContextManager.createLocalSpan("Gson/ToJson");
+        span.setComponent(ComponentsDefine.GSON);
+        Integer length = allArguments[0].toString().length();
+        span.tag("length", length.toString());
+
+    }
+
+    @Override
+    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
+                              Class<?>[] argumentsTypes,
+                              Object ret) throws Throwable {
+        ContextManager.stopSpan();
+        return ret;
+
+    }
+
+    @Override
+    public void handleMethodException(EnhancedInstance objInst, Method method,
+                               Object[] allArguments,
+                               Class<?>[] argumentsTypes, Throwable t) {
+        ContextManager.activeSpan().errorOccurred().log(t);
+    }
+}

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/gson/define/GsonFromJsonInstrumentation.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson.define;
+
+import net.bytebuddy.description.method.MethodDescription;
+import net.bytebuddy.matcher.ElementMatcher;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.ConstructorInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.InstanceMethodsInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassInstanceMethodsEnhancePluginDefine;
+import org.apache.skywalking.apm.agent.core.plugin.match.ClassMatch;
+import org.apache.skywalking.apm.agent.core.plugin.match.MultiClassNameMatch;
+
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static org.apache.skywalking.apm.agent.core.plugin.bytebuddy.ArgumentTypeNameMatch.takesArgumentWithType;
+
+
+/**
+ * @author withlin
+ */
+public class GsonFromJsonInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
+    public static final String INTERCEPTOR_CLASS = "org.apache.skywalking.apm.plugin.gson.GsonFromJsonInterceptor";
+    public static final String ENHANCE_CLASS = "com.google.gson.Gson";
+    public static final String ENHANCE_METHOD_DISPATCH = "fromJson";
+
+    @Override
+    protected ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
+        return new ConstructorInterceptPoint[0];
+    }
+
+    @Override
+    protected InstanceMethodsInterceptPoint[] getInstanceMethodsInterceptPoints() {
+        return new InstanceMethodsInterceptPoint[] {
+            new InstanceMethodsInterceptPoint() {
+                @Override public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named(ENHANCE_METHOD_DISPATCH)
+                        .and(takesArgumentWithType(0,"com.google.gson.stream.JsonReader"));
+                }
+
+
+                @Override public String getMethodsInterceptor() {
+                    return INTERCEPTOR_CLASS;
+                }
+
+                @Override public boolean isOverrideArgs() {
+                    return false;
+                }
+            }
+        };
+    }
+
+    @Override
+    protected ClassMatch enhanceClass() {
+        return MultiClassNameMatch.byMultiClassMatch(ENHANCE_CLASS);
+    }
+}

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/gson/define/GsonToJsonInstrumentation.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson.define;
+
+import net.bytebuddy.description.method.MethodDescription;
+import net.bytebuddy.matcher.ElementMatcher;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.ConstructorInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.InstanceMethodsInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassInstanceMethodsEnhancePluginDefine;
+import org.apache.skywalking.apm.agent.core.plugin.match.ClassMatch;
+import org.apache.skywalking.apm.agent.core.plugin.match.MultiClassNameMatch;
+
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static org.apache.skywalking.apm.agent.core.plugin.bytebuddy.ArgumentTypeNameMatch.takesArgumentWithType;
+
+
+/**
+ * @author withlin
+ */
+public class GsonToJsonInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
+    public static final String INTERCEPTOR_CLASS = "org.apache.skywalking.apm.plugin.gson.GsonToJsonInterceptor";
+    public static final String ENHANCE_CLASS = "com.google.gson.Gson";
+    public static final String ENHANCE_METHOD = "toJson";
+
+    @Override
+    protected ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
+        return new ConstructorInterceptPoint[0];
+    }
+
+    @Override
+    protected InstanceMethodsInterceptPoint[] getInstanceMethodsInterceptPoints() {
+        return new InstanceMethodsInterceptPoint[] {
+            new InstanceMethodsInterceptPoint() {
+                @Override public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named(ENHANCE_METHOD)
+                        .and(takesArgumentWithType(2,"com.google.gson.stream.JsonWriter"));
+                }
+
+
+                @Override public String getMethodsInterceptor() {
+                    return INTERCEPTOR_CLASS;
+                }
+
+                @Override public boolean isOverrideArgs() {
+                    return false;
+                }
+            },
+            new InstanceMethodsInterceptPoint() {
+                @Override
+                public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named(ENHANCE_METHOD)
+                        .and(takesArgumentWithType(1,"com.google.gson.stream.JsonWriter"));
+                }
+
+                @Override
+                public String getMethodsInterceptor() {
+                    return INTERCEPTOR_CLASS;
+                }
+
+                @Override
+                public boolean isOverrideArgs() {
+                    return false;
+                }
+            }
+        };
+    }
+
+    @Override
+    protected ClassMatch enhanceClass() {
+        return MultiClassNameMatch.byMultiClassMatch(ENHANCE_CLASS);
+    }
+}

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/main/resources/skywalking-plugin.def

+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+gson-2.8.x=org.apache.skywalking.apm.plugin.gson.define.GsonToJsonInstrumentation
+gson-2.8.x=org.apache.skywalking.apm.plugin.gson.define.GsonFromJsonInstrumentation
\ No newline at end of file

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/test/java/org/apache/skywalking/apm/plugin/gson/GsonFromJsonInterceptorTest.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson;
+
+import org.apache.skywalking.apm.agent.core.context.trace.AbstractTracingSpan;
+import org.apache.skywalking.apm.agent.core.context.trace.TraceSegment;
+import org.apache.skywalking.apm.agent.test.helper.SegmentHelper;
+import org.apache.skywalking.apm.agent.test.tools.AgentServiceRule;
+import org.apache.skywalking.apm.agent.test.tools.SegmentStorage;
+import org.apache.skywalking.apm.agent.test.tools.SegmentStoragePoint;
+import org.apache.skywalking.apm.agent.test.tools.TracingSegmentRunner;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.powermock.modules.junit4.PowerMockRunner;
+import org.powermock.modules.junit4.PowerMockRunnerDelegate;
+
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+
+
+@RunWith(PowerMockRunner.class)
+@PowerMockRunnerDelegate(TracingSegmentRunner.class)
+public class GsonFromJsonInterceptorTest {
+
+    private GsonFromJsonInterceptor gsonFromJsonInterceptor;
+
+    @SegmentStoragePoint
+    private SegmentStorage segmentStorage;
+
+    @Rule
+    public AgentServiceRule serviceRule = new AgentServiceRule();
+
+    private Object[] arguments;
+
+    private Class[] argumentType;
+
+
+
+
+    @Before
+    public void setUp() {
+        gsonFromJsonInterceptor = new GsonFromJsonInterceptor();
+        arguments = new Object[] {"100"};
+    }
+
+    @Test
+    public void testSendMessage() throws Throwable {
+        gsonFromJsonInterceptor.beforeMethod(null, null, arguments, null, null);
+        gsonFromJsonInterceptor.afterMethod(null, null, arguments, null, null);
+
+        List<TraceSegment> traceSegmentList = segmentStorage.getTraceSegments();
+        assertThat(traceSegmentList.size(), is(1));
+
+        TraceSegment segment = traceSegmentList.get(0);
+        List<AbstractTracingSpan> spans = SegmentHelper.getSpans(segment);
+        assertThat(spans.size(), is(1));
+    }
+
+}
\ No newline at end of file

apm-sniffer/optional-plugins/gson-2.8.x-plugin/src/test/java/org/apache/skywalking/apm/plugin/gson/GsonToJsonInterceptorTest.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.apm.plugin.gson;
+
+import org.apache.skywalking.apm.agent.core.context.trace.AbstractTracingSpan;
+import org.apache.skywalking.apm.agent.core.context.trace.TraceSegment;
+import org.apache.skywalking.apm.agent.test.helper.SegmentHelper;
+import org.apache.skywalking.apm.agent.test.tools.AgentServiceRule;
+import org.apache.skywalking.apm.agent.test.tools.SegmentStorage;
+import org.apache.skywalking.apm.agent.test.tools.SegmentStoragePoint;
+import org.apache.skywalking.apm.agent.test.tools.TracingSegmentRunner;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.powermock.modules.junit4.PowerMockRunner;
+import org.powermock.modules.junit4.PowerMockRunnerDelegate;
+
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+
+@RunWith(PowerMockRunner.class)
+@PowerMockRunnerDelegate(TracingSegmentRunner.class)
+public class GsonToJsonInterceptorTest {
+
+    private GsonToJsonInterceptor gsonToJsonInterceptor;
+
+    @SegmentStoragePoint
+    private SegmentStorage segmentStorage;
+
+    @Rule
+    public AgentServiceRule serviceRule = new AgentServiceRule();
+
+    private Object[] arguments;
+
+    private Class[] argumentType;
+
+
+
+
+    @Before
+    public void setUp() {
+        gsonToJsonInterceptor = new GsonToJsonInterceptor();
+        arguments = new Object[] {"100"};
+    }
+
+    @Test
+    public void testSendMessage() throws Throwable {
+        gsonToJsonInterceptor.beforeMethod(null, null, arguments, null, null);
+        gsonToJsonInterceptor.afterMethod(null, null, arguments, null, null);
+
+        List<TraceSegment> traceSegmentList = segmentStorage.getTraceSegments();
+        assertThat(traceSegmentList.size(), is(1));
+
+        TraceSegment segment = traceSegmentList.get(0);
+        List<AbstractTracingSpan> spans = SegmentHelper.getSpans(segment);
+        assertThat(spans.size(), is(1));
+    }
+
+}

apm-sniffer/optional-plugins/pom.xml

@@ -43,6 +43,7 @@
     <modules>
         <module>optional-spring-plugins</module>
         <module>trace-ignore-plugin</module>
+        <module>gson-2.8.x-plugin</module>
     </modules>
 
     <dependencies>

docker/config/component-libraries.yml

@@ -189,6 +189,9 @@ rabbitmq-consumer:
 Canal:
   id: 54
   languages: Java
+Gson:
+  id: 55
+  languages: Java
 
 # .NET/.NET Core components
 # [3000, 4000) for C#/.NET only

docs/en/setup/service-agent/java-agent/README.md

@@ -86,6 +86,7 @@ Now, we have the following known optional plugins.
 * [Trace Spring beans](agent-optional-plugins/Spring-bean-plugins.md)
 * [Trace Oracle and Resin](agent-optional-plugins/Oracle-Resin-plugins.md)
 * [Filter traces through specified endpoint name patterns](agent-optional-plugins/trace-ignore-plugin.md)
+* Gson serialization lib in optional plugin folder
 
 ## Advanced Features
 * Set the settings through system properties for config file override. Read [setting override](Setting-override.md).

docs/en/setup/service-agent/java-agent/Supported-list.md

@@ -56,6 +56,8 @@
   * [Elastic Job](https://github.com/elasticjob/elastic-job) 2.x
 * OpenTracing community supported
 * [Canal: Alibaba mysql database binlog incremental subscription & consumer components](https://github.com/alibaba/canal) 1.0.25 -> 1.1.2
+* JSON
+  * [GSON](https://github.com/google/gson) 2.8.x (Optional²)
 
 ¹Due to license incompatibilities/restrictions these plugins are hosted and released in 3rd part repository, 
  go to [OpenSkywalking java plugin extension repository](https://github.com/OpenSkywalking/java-plugin-extensions) to get these.

oap-server/server-starter/src/main/resources/component-libraries.yml

@@ -189,6 +189,9 @@ rabbitmq-consumer:
 Canal:
   id: 54
   languages: Java
+Gson:
+  id: 55
+  languages: Java
 
 
 # .NET/.NET Core components