Problem with FilePath.act() in custom pipeline step

['Richard Hierlmeier' via Jenkins Users]

I like to perform in a custom pipeline step some file operations on the 
slave node

The pipeline step calls the method doRemote:

def doRemote() {
    def repoDir = createFilePath("dir_in_repo")
    def callable = new MasterToSlaveFileCallable<Integer>() {

                private static final long serialVersionUID = 1;

                public Integer invoke(File rootDirectory, VirtualChannel 
channel) throws IOException, InterruptedException {
                    def count = 0
                    if(rootDirectory.exists()) {
                        // TODO
                    }
                    return 0
                }
            };
    def count = repoDir.act(callable);
}

def createFilePath(path) {
    if (env['NODE_NAME'] == null) {
        error "envvar NODE_NAME is not set, probably not inside an node {} 
or running an older version of Jenkins!";
    } else if (env['NODE_NAME'].equals("master")) {
        return new FilePath(path);
    } else {
        return new FilePath(Jenkins.getInstance().getComputer(env[
'NODE_NAME']).getChannel(), path);
    }
}



Whenever the step is executed it fails with the following exception:

[Bitbucket] Build result notified
java.lang.IllegalArgumentException: Unable to locate class file for class 
customStep$1
        at hudson.remoting.Which.classFileUrl(Which.java:61)
        at 
hudson.remoting.RemoteClassLoader$ClassLoaderProxy.fetch4(RemoteClassLoader.java:847)
        at 
hudson.remoting.RemoteClassLoader$ClassLoaderProxy.fetch3(RemoteClassLoader.java:875)


I moved already the anonymous class into a separate file. It did also not 
work.

Is it not possible to use the FilePath.act method in a custom pipeline step?

  Richard


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