Issue
everyone.
I was trying to execute " mvn clean test " to verify a simple maven project which was generated by "mvn archetype:generate".I just to want learning how to write unit test.But I got a exception , after a long time debug and trying , I don't know how to continue,please give me some advice. Because I don't know what's wrong, so I will try to give as much info as I can.
os:
mac os 11.2.3(big sur with m1 chip)
jdk:
openjdk version "1.8.0_282"
OpenJDK Runtime Environment (Zulu 8.52.0.23-CA-macos-aarch64) (build 1.8.0_282-b08)
OpenJDK 64-Bit Server VM (Zulu 8.52.0.23-CA-macos-aarch64) (build 25.282-b08, mixed mode)
maven: apache-maven-3.8.1(I also tried 3.6.3)
pom.xml:
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.jmockit</groupId>
<artifactId>jmockit</artifactId>
<version>1.36</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
main java code :
package com.juexi.learning;
/**
* Hello world!
*
*/
public class App {
public int getId() {
return 333;
}
}
test java code:
package com.juexi.learning;
import org.junit.Assert;
import org.junit.Test;
import mockit.Mocked;
/**
* Unit test for simple App.
*/
public class AppTest {
@Mocked
App app;
@Test
public void testApp() {
Assert.assertSame(1, app.getId());
}
}
stack trace info:
Running com.juexi.learning.AppTest
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at mockit.internal.startup.AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(AgentLoader.java:80)
at mockit.internal.startup.AgentLoader.loadAgent(AgentLoader.java:52)
at mockit.internal.startup.Startup.initializeIfPossible(Startup.java:147)
at org.junit.runner.Runner.<clinit>(Runner.java:22)
at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:250)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.lang.reflect.InvocationTargetException
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 mockit.internal.startup.AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(AgentLoader.java:76)
... 20 more
Caused by: java.lang.UnsatisfiedLinkError: sun.tools.attach.BsdVirtualMachine.createAttachFile(Ljava/lang/String;)V
at sun.tools.attach.BsdVirtualMachine.createAttachFile(Native Method)
at sun.tools.attach.BsdVirtualMachine.<init>(BsdVirtualMachine.java:74)
... 25 more
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.047 sec <<< FAILURE!
testApp(com.juexi.learning.AppTest) Time elapsed: 0.003 sec <<< ERROR!
java.lang.NullPointerException
at com.juexi.learning.AppTest.testApp(AppTest.java:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Results :
Tests in error:
testApp(com.juexi.learning.AppTest)
what I have tried: I tried to debug and I got this in class BsdVirtualMachine.class
public BsdVirtualMachine(AttachProvider provider, String vmid)
throws AttachNotSupportedException, IOException
{
super(provider, vmid);
// This provider only understands pids
int pid;
try {
pid = Integer.parseInt(vmid);
} catch (NumberFormatException x) {
throw new AttachNotSupportedException("Invalid process identifier");
}
// Find the socket file. If not found then we attempt to start the
// attach mechanism in the target VM by sending it a QUIT signal.
// Then we attempt to find the socket file again.
path = findSocketFile(pid);
if (path == null) {
File f = new File(tmpdir, ".attach_pid" + pid);
createAttachFile(f.getPath()); // this line is where the exception comes from
try {
sendQuitTo(pid);
....
and it invoke in ClassLoader.class :
static long findNative(ClassLoader loader, String name) {
Vector<NativeLibrary> libs =
loader != null ? loader.nativeLibraries : systemNativeLibraries;
synchronized (libs) {
int size = libs.size();
for (int i = 0; i < size; i++) {
NativeLibrary lib = libs.elementAt(i);
long entry = lib.find(name);
if (entry != 0)
return entry;
}
}
return 0;
}
It seems a native method createAttachFile(String path) tried to create a file ,and the ClassLoader was trying to load this native method from local, but it can not find this method in /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre/lib/libattach.dylib ( I find this by debuging). so, what can I do to fix this problem?and I don't know how to do next.could someone help me?
Solution
With @Mells 's help,I post this issue to the developers of jmockit .for more please check github
And,the developer told me that this was because zulujdk8 remove the native method.
-JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_createAttachFile(JNIEnv *env, jclass cls, jstring path)
+JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_createAttachFile0(JNIEnv *env, jclass cls, jstring path)
Answered By - lollipop
