forking plugin execution?

Is it possible to fork plugin execution so that it executes in a separate
process?

I think doxia+markdown has a threading bug with peg down.

I get the attached exception.

Works fine with default options but -T 8 breaks it.

I assume if I just have the site plugin in a separate proc that it will
probably work since I won’t have two site builds stepping on each other.

java.lang.ClassCastException: java.lang.Integer cannot be cast to
org.pegdown.ast.SuperNode

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:353)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.OneOrMoreMatcher.match(OneOrMoreMatcher.java:38)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.FirstOfMatcher.match(FirstOfMatcher.java:41)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.FirstOfMatcher.match(FirstOfMatcher.java:41)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.ZeroOrMoreMatcher.match(ZeroOrMoreMatcher.java:39)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

at org.parboiled.parserunners.BasicParseRunner.run(BasicParseRunner.java:72)

at
org.parboiled.parserunners.ReportingParseRunner.runBasicMatch(ReportingParseRunner.java:86)

at
org.parboiled.parserunners.ReportingParseRunner.run(ReportingParseRunner.java:66)

at
org.parboiled.parserunners.AbstractParseRunner.run(AbstractParseRunner.java:81)

at org.pegdown.Parser.parseToParsingResult(Parser.java:1329)

at org.pegdown.Parser.parseInternal(Parser.java:1316)

at org.pegdown.Parser.parse(Parser.java:78)

at org.pegdown.PegDownProcessor.parseMarkdown(PegDownProcessor.java:137)

at
org.apache.maven.doxia.module.markdown.MarkdownParser.parse(MarkdownParser.java:170)

at org.apache.maven.doxia.DefaultDoxia.parse(DefaultDoxia.java:65)

at
org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderDocument(DefaultSiteRenderer.java:398)

at
org.apache.maven.doxia.siterenderer.DoxiaDocumentRenderer.renderDocument(DoxiaDocumentRenderer.java:51)

at
org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:311)

at
org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:129)

at
org.apache.maven.plugins.site.render.SiteMojo.renderDoxiaDocuments(SiteMojo.java:261)

at
org.apache.maven.plugins.site.render.SiteMojo.renderLocale(SiteMojo.java:172)

at org.apache.maven.plugins.site.render.SiteMojo.execute(SiteMojo.java:141)

at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)

... 14 more

Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast
to org.pegdown.ast.SuperNode

at org.pegdown.Parser.addAsChild(Parser.java:1251)

at org.pegdown.Action$mNyPdk1ujbVDZrIU.run(Unknown Source)

at org.parboiled.matchers.ActionMatcher.match(ActionMatcher.java:96)

at
org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)

at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:338)

... 65 more

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