Why do I get a StackoverflowError on when Groovy JsonBuilder tries to serialize an Expando?

Question

I am getting a StackoverflowError (not traced back to my code) when I try to serialize an Expando. Reproduced with groovy shell:

... groovy-2.0.6/bin/groovysh new groovy.json.JsonBuilder(new Expando(name:'hello')).toString()
FATAL: java.lang.StackOverflowError
java.lang.StackOverflowError
        at java.lang.Exception.<init>(Exception.java:77)
        at java.lang.reflect.InvocationTargetException.<init>(InvocationTargetException.java:54)
        at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
...

This should work right?

score 3 · Accepted Answer · edited Mar 24 '21 at 09:52

3

Wow..It's a bug. Looks like it was introduced at 1.8.8

works at 1.8.6:

groovy-1.8.6/bin/groovysh new groovy.json.JsonBuilder(new Expando(name:'hello')).toString();

===> {"name":"hello"}

StackoverflowError at 1.8.8:

groovy-1.8.8/bin/groovysh new groovy.json.JsonBuilder(new Expando(name:'hello')).toString();
FATAL: java.lang.StackOverflowError
java.lang.StackOverflowError

Looks like there is a bug filed on 2.1.0rc1: https://issues.apache.org/jira/browse/GROOVY-5918

edited Mar 24 '21 at 09:52

Lifeweaver

986
8
29

answered Jan 18 '13 at 20:28

Andy Hebert

413
4
12

Good catch, [submitted a pull request](https://github.com/groovy/groovy-core/pull/120) that hopefully fixes it – tim_yates Jan 20 '13 at 21:11
The pull request has been accepted so the next version of 2.1.0 (either final or rc3 if there is one) should work – tim_yates Jan 21 '13 at 10:29
2

Looks like it's fixed in 2.0.7, 2.1.0 and 2.1.0-rc-3 :-) – tim_yates Jan 21 '13 at 10:40

Why do I get a StackoverflowError on when Groovy JsonBuilder tries to serialize an Expando?

1 Answers1