如果我在我的代理中声明此建议:
public static class SequenceAdvice {
@Advice.OnMethodEnter
static void enter(@Advice.This Object thiz,
@Advice.Origin Method method,
@Advice.AllArguments Object... args) {
StackWalker walker =
StackWalker.getInstance(RETAIN_CLASS_REFERENCE);
walker.forEach(sf ->
System.out.println(sf.getClassName() + "." + sf.getMethodName())
);
}
}
asjavac
将 lambda 表达式编译为私有方法(至少在 OpenJDK 11 中):
public class SequenceAgent$SequenceAdvice {
...
private static void lambda$enter$0(java.lang.StackWalker$StackFrame);
...
}
当代理附加到程序并执行程序时,会导致程序崩溃:
Exception in thread "main" java.lang.IllegalAccessError:
class DemoController tried to access private method
SequenceAgent$SequenceAdvice.lambda$enter$0(
Ljava/lang/StackWalker$StackFrame;)V
(DemoController and SequenceAgent$SequenceAdvice
are in unnamed module of loader 'app')
at DemoController.getDemos(DemoController.java)
at DemoMain.main(DemoMain.java:13)
理想情况下,我不喜欢使用对象而不是 lambda 表达式来解决这个问题:
public static class SequenceAdvice {
public static Consumer<StackWalker.StackFrame> SF_CONSUMER =
new Consumer<>() {
@Override
public void accept(StackWalker.StackFrame sf) {
System.out.println(sf.getClassName() + "." + sf.getMethodName());
}
};
@Advice.OnMethodEnter
static void enter(@Advice.This Object thiz,
@Advice.Origin Method method,
@Advice.AllArguments Object... args) {
StackWalker walker = StackWalker.getInstance(RETAIN_CLASS_REFERENCE);
walker.forEach(SF_CONSUMER);
}
}
自定义许可安全策略似乎无法解决此错误:
grant {
permission java.security.AllPermission;
};
有没有办法暂时禁用此类安全检查(例如“访问私有方法”)?