我在 Jenkinsfile 中运行以下 groovy 脚本，该脚本在构建过程中执行：
import java.util.stream.Collectors
import java.util.stream.Stream
import groovy.transform.Field
@Field
Map<String, String> sampleMap = [
'SampleKey1': 'SampleValue1',
'SampleKey2': 'SampleValue2'
]
//example param value: "C/SampleKey1/someFile, C/SampleKey2/someFile2"
private Collection<String> getValues(String param) {
Stream.of(param.split(','))
.map { getValueFromOnePath(it) }
.filter { !it.isEmpty() }
.distinct()
.collect(Collectors.toList())
}
private String getValueFromOnePath(String path) {
String[] pathParts = path.split('/')
if (pathParts.size() < 2) {
return ''
}
return sampleMap[pathParts[1]] ?: ''
}
上述代码对参数值的预期结果等于：
"C/SampleKey1/someFile, C/SampleKey2/someFile2"
是：
[SampleValue1, SampleValue2]
但是，当这段代码在 Jenkins 上执行时，我收到一个我无法理解的奇怪错误(为什么会发生)：
hudson.remoting.ProxyException： org.codehaus.groovy.runtime.typehandling.GroovyCastException： 无法将带有类 'java.lang.String' 的对象 'SampleValue1' 强制转换为类 'java.util.Collection' at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java：405) at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java：319) at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnCollection(DefaultTypeTransformation.java：267) at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java：219) at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java：603) 在未知.未知(未知) atcps.transform(Native Method) at com.cloudbees.groovy.cps.impl.LocalVariableBlock$LocalVariable.set(LocalVariableBlock.java：45) at com.cloudbees.groovy.cps.impl.AssignmentBlock$ContinuationImpl.assignAndDone(AssignmentBlock.java：70) at sun.reflect.GeneratedMethodAccessor303.invoke(未知来源) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java：43) at java.lang.reflect.Method.invoke(Method.java：498) at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java：72) at com.cloudbees.groovy.cps.impl.LocalVariableBlock$LocalVariable.get(LocalVariableBlock.java：39) at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java：30) at com.cloudbees.groovy.cps.impl.LocalVariableBlock.evalLValue(LocalVariableBlock.java：28) at com.cloudbees.groovy.cps.LValueBlock$BlockImpl.eval(LValueBlock.java：55) at com.cloudbees.groovy.cps.LValueBlock.eval(LValueBlock.java：16) at com.cloudbees.groovy.cps.Next.step(Next.java：83) at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java：174) at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java：163) at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java：122) at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java：261) at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java：163) at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java：19) at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java：35) at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java：32) at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java：108) at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java：32) at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java：174) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java：331) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java：82) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java：243) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java：231) at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java：64) at java.util.concurrent.FutureTask.run(FutureTask.java：266) at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java：112) at jenkins.util.ContextResetExecutorService$1.run(ContextResetExecutorService.java：28) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java：511) at java.util.concurrent.FutureTask.run(FutureTask.java：266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java：1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java：624) at java.lang.Thread.run(Thread.java：748)
有什么想法吗？
您可以尝试使用@NonCPS注释来注释getValues。还要尽量避免在将在 Jenkins 沙箱中执行的代码中使用 Streams，这通常是导致错误的原因。希望对您有所帮助。