HashCodeBuilder throws StackOverflowError in bidirectional navigable association
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Key: LANG-456
URL: https://issues.apache.org/jira/browse/LANG-456
Project: Commons Lang
Issue Type: Bug
Affects Versions: 2.4
Environment: Widows XP. Sun JDK 1.5 or 1.6.
Reporter: Bob Fields
This is not the reflection methods, it is the regular HashCodeBuilder append
methods. It causes EqualsBuilder, ToStringBuilder, CompareToBuilder to also
throw the StackOverflowException, but those methods work when one of the
HashCodeBuilder bidirectional association attributes .hashCode() is commented
out. The problem is that all of the builders call registerObject() which
creates a hashCode, but only the reflectionAppend method checks if an object is
registered.
Bi-directional associations are a very common pattern in Jaxb and Hibernate. In
this case, I generate code from a model in order to avoid the reflection
penalty - I already know what the attributes are at compile time, so I use
.append instead of .reflectionAppend.
See attached example + unit test. One side of the bidirectional association
must be commented out in the hashCode method.
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