The NPE is at BytecodeDescriptor.parseSig#83, which says:
return loader.loadClass(name);
so the null ref seems likely to be loader. The loader is initially
passed in from BoundMethodHandle#817, which provides a null loader,
indicating that it wants the system loader. At the start of
parseMethod, we see:
if (loader == null)
loader = ClassLoader.getSystemClassLoader();
so the loader variable that is being deref'ed is the result of
ClassLoader.getSystemClassLoader, which must be null in order to NPE
here. ClassLoader.getSystemClassLoader checks for a security manager,
but since you're still initializing the security manager, this is likely
to be null. So you're going to get the value of `scl` after
`initSystemClassLoader` has completed.
Overall this smells of a bootstrapping issue; you're calling into the MH
machinery possibly before the classloading machinery (and definitely
before the security manager) is fully initialized, and you're getting
back a null from ClassLoader.getSystemClassLoader.
HTH,
-Brian
On 3/30/2015 11:24 AM, Wang Weijun wrote:
I have a customized security manager:
import java.security.AccessController;
import java.security.PrivilegedAction;
public class A3 extends SecurityManager {
public A3() {
// 1. Using lambda
AccessController.doPrivileged((PrivilegedAction<Void>)
() -> null);
// 2. Using inner class
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
public Void run() {
return null;
}
});
}
}
If I use the inner class, everything is OK. If the lambda, I see this error:
$ java -Djava.security.manager=A3
Error occurred during initialization of VM
java.lang.ExceptionInInitializerError
at
java.lang.invoke.BoundMethodHandle.<clinit>(BoundMethodHandle.java:829)
at java.lang.invoke.LambdaForm.createIdentityForms(LambdaForm.java:1753)
at java.lang.invoke.LambdaForm.<clinit>(LambdaForm.java:1808)
at
java.lang.invoke.DirectMethodHandle.makePreparedLambdaForm(DirectMethodHandle.java:223)
at
java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:188)
at
java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:177)
at java.lang.invoke.DirectMethodHandle.make(DirectMethodHandle.java:84)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodCommon(MethodHandles.java:1655)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodNoSecurityManager(MethodHandles.java:1612)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodForConstant(MethodHandles.java:1797)
at
java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1746)
at
java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:477)
at A3.<init>(A3.java:6)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:444)
at sun.misc.Launcher.<init>(Launcher.java:96)
at sun.misc.Launcher.<clinit>(Launcher.java:57)
at java.lang.ClassLoader.initSystemClassLoader(ClassLoader.java:1440)
at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:1425)
Caused by: java.lang.NullPointerException
at
sun.invoke.util.BytecodeDescriptor.parseSig(BytecodeDescriptor.java:83)
at
sun.invoke.util.BytecodeDescriptor.parseMethod(BytecodeDescriptor.java:54)
at
sun.invoke.util.BytecodeDescriptor.parseMethod(BytecodeDescriptor.java:41)
at
java.lang.invoke.MethodType.fromMethodDescriptorString(MethodType.java:1065)
at
java.lang.invoke.BoundMethodHandle$Factory.makeCbmhCtor(BoundMethodHandle.java:817)
at
java.lang.invoke.BoundMethodHandle$Factory.makeCtors(BoundMethodHandle.java:772)
at
java.lang.invoke.BoundMethodHandle$SpeciesData.initForBootstrap(BoundMethodHandle.java:358)
at
java.lang.invoke.BoundMethodHandle$SpeciesData.<clinit>(BoundMethodHandle.java:447)
at
java.lang.invoke.BoundMethodHandle.<clinit>(BoundMethodHandle.java:829)
at java.lang.invoke.LambdaForm.createIdentityForms(LambdaForm.java:1753)
at java.lang.invoke.LambdaForm.<clinit>(LambdaForm.java:1808)
at
java.lang.invoke.DirectMethodHandle.makePreparedLambdaForm(DirectMethodHandle.java:223)
at
java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:188)
at
java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:177)
at java.lang.invoke.DirectMethodHandle.make(DirectMethodHandle.java:84)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodCommon(MethodHandles.java:1655)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodNoSecurityManager(MethodHandles.java:1612)
at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodForConstant(MethodHandles.java:1797)
at
java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1746)
at
java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:477)
at A3.<init>(A3.java:6)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:444)
Any reason why?
Thanks
Max
