Java 代理忽略应用程序类路径
Java Agent ignores application classpath
我正在编写我的第一个 java 代理，我遇到了一个问题，它没有加载我要附加代理的应用程序的 classes。
目前，代理很简单：
public class Main {
public static void premain(String agentArgs, Instrumentation inst) {
transformClass(inst);
}
public static void agentmain(String agentArgs, Instrumentation inst) {
transformClass(inst);
}
private static void transformClass(Instrumentation instrumentation) {
System.out.println("Hello from agent!");
for (Class<?> clazz : instrumentation.getAllLoadedClasses()) {
System.out.println(clazz.getName());
}
}
}
清单:
Manifest-Version: 1.0
Can-Set-Native-Method-Prefix: true
Premain-Class: com.dvelopp.agenttest.Main
Agent-Class: com.dvelopp.agenttest.Main
Can-Redefine-Classes: true
Can-Retransform-Classes: true
当我 运行 我的应用程序使用此代理时，它只打印它的 classes（不打印我的应用程序的主要 class）。
我的应用程序：
package com.dvelopp.agentconsumer;
public class Test {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
运行 结果：
java -javaagent:./agenttest/target/agent-test-1.0-SNAPSHOT-jar-with-dependencies.jar -cp ./agent-consumer/out/production/agent-consumer/ com.dvelopp.agentconsumer.Test
com.dvelopp.agenttest.Main
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java.util.stream.FindOps$FindSink$OfRef$$Lambda/0x0000000800062840
jdk.internal.module.DefaultRoots$$Lambda/0x0000000800062440
java.util.stream.Collectors$$Lambda/0x0000000800062040
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Hello World!
有com.dvelopp.agenttest.Main，但没有com.dvelopp.agentconsumer.Test。为什么它会忽略我的应用程序的 class 路径？
premain方法先于main方法执行。顾名思义，数组中只包含加载的 classes。在执行代理的时间点，main class 还没有加载。
我正在编写我的第一个 java 代理，我遇到了一个问题，它没有加载我要附加代理的应用程序的 classes。
目前，代理很简单：
public class Main {
public static void premain(String agentArgs, Instrumentation inst) {
transformClass(inst);
}
public static void agentmain(String agentArgs, Instrumentation inst) {
transformClass(inst);
}
private static void transformClass(Instrumentation instrumentation) {
System.out.println("Hello from agent!");
for (Class<?> clazz : instrumentation.getAllLoadedClasses()) {
System.out.println(clazz.getName());
}
}
}
清单:
Manifest-Version: 1.0
Can-Set-Native-Method-Prefix: true
Premain-Class: com.dvelopp.agenttest.Main
Agent-Class: com.dvelopp.agenttest.Main
Can-Redefine-Classes: true
Can-Retransform-Classes: true
当我 运行 我的应用程序使用此代理时，它只打印它的 classes（不打印我的应用程序的主要 class）。
我的应用程序：
package com.dvelopp.agentconsumer;
public class Test {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
运行 结果：
java -javaagent:./agenttest/target/agent-test-1.0-SNAPSHOT-jar-with-dependencies.jar -cp ./agent-consumer/out/production/agent-consumer/ com.dvelopp.agentconsumer.Test
com.dvelopp.agenttest.Main
java.util.stream.FindOps$FindSink$OfRef$$Lambda/0x0000000800063440
java.util.stream.FindOps$FindSink$OfRef$$Lambda/0x0000000800063040
java.util.stream.FindOps$FindSink$OfRef$$Lambda/0x0000000800062c40
java.util.stream.FindOps$FindSink$OfRef$$Lambda/0x0000000800062840
jdk.internal.module.DefaultRoots$$Lambda/0x0000000800062440
java.util.stream.Collectors$$Lambda/0x0000000800062040
java.util.stream.Collectors$$Lambda/0x0000000800061c40
java.util.stream.Collectors$$Lambda/0x0000000800061840
java.util.stream.Collectors$$Lambda/0x0000000800061440
jdk.internal.module.DefaultRoots$$Lambda/0x0000000800061040
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java.lang.CharSequence
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Hello World!
有com.dvelopp.agenttest.Main，但没有com.dvelopp.agentconsumer.Test。为什么它会忽略我的应用程序的 class 路径？
premain方法先于main方法执行。顾名思义，数组中只包含加载的 classes。在执行代理的时间点，main class 还没有加载。