Getting stack overflow error converting from Twiki

Jim Starr

Getting the following error when trying to use the CLI to convert a Twiki for Confluence 4.1.4:

Exception in thread "main" java.lang.StackOverflowError
at java.util.regex.Pattern.sequence(Pattern.java:1906)
at java.util.regex.Pattern.expr(Pattern.java:1769)
at java.util.regex.Pattern.group0(Pattern.java:2547)
at java.util.regex.Pattern.sequence(Pattern.java:1823)
at java.util.regex.Pattern.expr(Pattern.java:1769)
at java.util.regex.Pattern.compile(Pattern.java:1477)
at java.util.regex.Pattern.<init>(Pattern.java:1150)
at java.util.regex.Pattern.compile(Pattern.java:840)
at com.atlassian.uwc.hierarchies.TWikiHierarchy.getAncestors(TWikiHierarchy.java:125)
at com.atlassian.uwc.hierarchies.TWikiHierarchy.getAncestors(TWikiHierarchy.java:152)
at com.atlassian.uwc.hierarchies.TWikiHierarchy.getAncestors(TWikiHierarchy.java:152)
at com.atlassian.uwc.hierarchies.TWikiHierarchy.getAncestors(TWikiHierarchy.java:152)

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Gregory Suddert

Have you turned up the java VM memory numbers? What is the command line you're using to run the command?

You can use the -Xmx8m argument to (for instance) increase the memory for the VM to 8meg. You might need a lot mor than that!

Example file toy.java:

public class toy
{
        public static void main(String[] args)
        {
                Runtime runtime = Runtime.getRuntime();

                System.out.println("Total Memory: " + 

		runtime.maxMemory() / (1024 * 1024) + "mb");

                System.exit(0);
        }
}

Example compile:

% javac toy.java

Example run with default:

% java toy
Total Memory: 81mb

Example run with 111 meg of heap:

% java -Xmx111m toy
Total Memory: 108mb

Increase away! It won't hurt anything, change anything permanently, etc. It will make it slower especially if the machine doesn't have enough RAM but it'll have a chance. Like on PC's where the first thing you do is reboot, in Java, the 1st thing you look for is "not enough memory". From the stack indications (line numbers) its a memory kabooey due to recursion. You might have to turn the thing up to 100, 200, 500m, who knows?

G.