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https://issues.apache.org/jira/browse/LOG4J2-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15432870#comment-15432870
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Rogério Lecarião Leite commented on LOG4J2-1542:
------------------------------------------------
Hi Ralph,
I am newbie on Jira, but the correction is like as Math.max(-1,1) or
Math.max(0,1).
private void init(final String messagePattern) {
this.messagePattern = messagePattern;
this.indices = new int[messagePattern == null ? 0 :
messagePattern.length() >> 1]; // divide by 2
final int placeholders =
ParameterFormatter.countArgumentPlaceholders2(messagePattern, indices);
initThrowable(argArray, placeholders);
this.usedCount = Math.min(placeholders, argArray == null ? 0 :
argArray.length);
}
private void init(final String messagePattern) {
int arraySize = messagePattern == null ? 0 :
Math.max(messagePattern.length() >> 1, 1);
this.messagePattern = messagePattern;
this.indices = new int[arraySize];
final int placeholders =
ParameterFormatter.countArgumentPlaceholders2(messagePattern, indices);
initThrowable(argArray, placeholders);
this.usedCount = Math.min(placeholders, argArray == null ? 0 :
argArray.length);
}
Some Tests:
- Test with empty string
- Test with one character string
This would be enough? :D
> java.lang.ArrayIndexOutOfBoundsException
> ----------------------------------------
>
> Key: LOG4J2-1542
> URL: https://issues.apache.org/jira/browse/LOG4J2-1542
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.6.2
> Environment: Array length logic causes throw
> java.lang.ArrayIndexOutOfBoundsException
> Reporter: Rogério Lecarião Leite
> Priority: Critical
> Labels: easyfix
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> This error is reproducible when method fomarTo of the class
> ParameterizedMessage is invoked.
> This root cause is the method init of same class where is invoked, in the
> this.indices is initializaded with messagePattern.length() >> 1 run to equals
> zero because that messagePattern.length() is 1 (string with one character).
> I used File Appender in my XML config and I wrote my code with
> logger.trace("a").
> My PatternLayout used is pattern="%m" (simplest).
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