控制台报错：

C:\workspace\selfspace\src>btrace 9056 HelloBtrace.java
Exception in thread "main" java.lang.NullPointerException
        at com.sun.btrace.client.Client.submit(Client.java:369)
        at com.sun.btrace.client.Main.main(Main.java:201)
Exception in thread "Thread-0" java.lang.IllegalStateException
        at com.sun.btrace.client.Client.send(Client.java:487)
        at com.sun.btrace.client.Client.sendExit(Client.java:421)
        at com.sun.btrace.client.Main$2.run(Main.java:235)
        at java.lang.Thread.run(Thread.java:748)

IDEA报错:

btrace DEBUG: adding to boot classpath failed!
btrace DEBUG: java.io.FileNotFoundException: . (拒绝访问。)
java.io.FileNotFoundException: . (拒绝访问。)
    at java.util.zip.ZipFile.open(Native Method)
    at java.util.zip.ZipFile.<init>(ZipFile.java:225)
    at java.util.zip.ZipFile.<init>(ZipFile.java:155)
    at java.util.jar.JarFile.<init>(JarFile.java:166)
    at java.util.jar.JarFile.<init>(JarFile.java:130)
    at com.sun.btrace.agent.Main.main(Main.java:129)
    at com.sun.btrace.agent.Main.agentmain(Main.java:105)
    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 sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386)
    at sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:411)

原因：项目中btrace的jar包版本和安装的btrace的jar包版本不一致

如果Java VisualVM安装BTrace Workbench不能使用，在jdk的安装目录lib文件夹下复制btrace/build的3个jar包