我正在为一个类项目编写一些代码，该项目将作业发送到 GCP 中的 dataproc 集群。我最近遇到了一个奇怪的错误，但我无法理解它。错误如下：
Exception in thread "Thread-5" java.lang.NoClassDefFoundError: io/grpc/CallCredentials2
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at com.google.api.gax.grpc.GrpcCallContext.withCredentials(GrpcCallContext.java:160)
at com.google.api.gax.grpc.GrpcCallContext.withCredentials(GrpcCallContext.java:67)
at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:210)
at com.google.cloud.dataproc.v1.stub.GrpcJobControllerStub.create(GrpcJobControllerStub.java:130)
at com.google.cloud.dataproc.v1.stub.JobControllerStubSettings.createStub(JobControllerStubSettings.java:215)
at com.google.cloud.dataproc.v1.JobControllerClient.<init>(JobControllerClient.java:139)
at com.google.cloud.dataproc.v1.JobControllerClient.create(JobControllerClient.java:120)
at com.shayr.searchEngineGUI.searchEngineGUI.constructInvertedIndices(searchEngineGUI.java:509)
at com.shayr.searchEngineGUI.searchEngineGUI.access$0(searchEngineGUI.java:501)
at com.shayr.searchEngineGUI.searchEngineGUI$2.run(searchEngineGUI.java:474)
Caused by: java.lang.ClassNotFoundException: io.grpc.CallCredentials2
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 22 more
我的代码中触发此问题的行是：
JobControllerClient jobControllerClient = JobControllerClient.create(jobControllerSettings);
我最初尝试查找有关 CallCredentials2 的更多信息，以找出导致问题的原因，但我找不到太多任何内容，除了该类是对 …