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Bug
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Resolution: Fixed
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Major
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Jenkins 1.6.11
Workflow 1.6
The method pointer operator (.&) is entirely broken. The following test:
def bar = 'foo'.&toUpperCase
Results in:
startup failed: General error during canonicalization: java.lang.UnsupportedOperationException
Plus a giant call stack.
The workaround is to instead explicitly create a closure which calls the method, which is syntactically cumbersome and reduces semantic readability.
- is duplicated by
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- Resolved
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- is related to
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- Closed
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[JENKINS-28321] Method pointer operator (.&) broken
Following works by the way:
def build() {
def methodRef = this.&prepareConfig()
methodRef // prepareConfig() method will be called here
}
def prepareConfig() {
}
def build() {
def ref = methodRef()
ref // prepareConfig() method will be called here
}
def methodRef() {
return this.&prepareConfig()
}
def prepareConfig() {
}
So it's not entirely broken.
This works in workflow-cps 2.39 and has testing - specifically covering that you can't escape the sandbox through utilization of method pointers, but just getting that far and the specific error message verifies that this works otherwise.
You need test coverage demonstrating that the calls works as intended if it is whitelisted.
Code changed in jenkins
User: Andrew Bayer
Path:
src/test/java/org/jenkinsci/plugins/workflow/cps/CpsFlowDefinition2Test.java
http://jenkins-ci.org/commit/workflow-cps-plugin/ee83ee52d5d14e30cc2c3092ae5463add860ab73
Log:
JENKINS-28321 Verify that whitelisted method pointers can be used.
Just one of many exotic Groovy language features not currently supported by the CPS engine.