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https://issues.apache.org/jira/browse/LANG-456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633948#action_12633948
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Sebb commented on LANG-456:
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Thanks for the updated test case which causes the expected stack overflow.
In fact LANG is currently targeted at Java 1.2 - I believe it may be used by
Java ME code, which is not so easily upgraded.
==
Since the HashCode for the Bidirectional class depends on the hash code for the
JavBVO class and vice versa, it's not surprising that there is a stack overflow.
If you were not using the HashCodeBuider, how would you define the hashcodes?
> HashCodeBuilder throws StackOverflowError in bidirectional navigable
> association
> --------------------------------------------------------------------------------
>
> 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
> Attachments: HashCodeBuilderStackOverflow.zip, StackOverflowError.zip
>
>
> 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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