[英]How to resolve "java.lang.NullPointerException: Cannot invoke method startsWith()"?
I am new to groovy. I am writing a shared library for Jenkins pipeline.我是 groovy 的新手。我正在为 Jenkins 管道编写一个共享库。 I am facing this
java.lang.NullPointerException
exception.我正面临这个
java.lang.NullPointerException
异常。 Below is my code:下面是我的代码:
def call(Map config = [:], env) {
pipeline {
defaults = [
'pipelineStrategy' : 'deployOnly',
'buildSystem' : 'maven'
] + config
environment {
BRANCH_NAME = "${GIT_BRANCH.split("/")[1]}"
}
boolean autoDeploy = false;
if (env.BRANCH_NAME.equals('master') || env.BRANCH_NAME.startsWith('hotfix-')){
autoDeploy = true;
}
}
}
Below are my Jenkins build logs:以下是我的 Jenkins 构建日志:
java.lang.NullPointerException: Cannot invoke method startsWith() on null object
at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:35)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:20)
at pipelineStrategy.call(pipelineStrategy.groovy:21)
The only startsWith() in the code you posted is in您发布的代码中唯一的 startsWith() 位于
env.BRANCH_NAME.startsWith('hotfix-')
and you are being told that there is a null object. It means that你被告知有一个 null object。这意味着
env.BRANCH_NAME
is null. You will need to think why or how to handle that situation.是 null。您需要考虑为什么或如何处理这种情况。 One way might be to use
一种方法可能是使用
String.valueOf(env.BRANCH_NAME).startsWith('hotfix-')
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