Use of a shared DocumentBuilder causes SAXException during parallel resolutions
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Key: IVY-1147
URL: https://issues.apache.org/jira/browse/IVY-1147
Project: Ivy
Issue Type: Bug
Components: Core
Affects Versions: 2.1.0
Environment: Vista 32bit Sun JDK 1.6.0_17
Reporter: Brian Atkinson
I am in need of running multiple instances of ivy in parallel from within the
same jvm. When I do this I am seeing the following exception:
org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
at
com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:253)
at
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:153)
at org.apache.ivy.util.XMLHelper.parseToDom(XMLHelper.java:198)
at org.apache.ivy.plugins.parser.m2.PomReader.<init>(PomReader.java:94)
at
org.apache.ivy.plugins.parser.m2.PomModuleDescriptorParser.parseDescriptor(PomModuleDescriptorParser.java:115)
at
org.apache.ivy.plugins.parser.m2.PomModuleDescriptorParser.parseDescriptor(PomModuleDescriptorParser.java:105)
at
org.apache.ivy.core.cache.DefaultRepositoryCacheManager$MyModuleDescriptorProvider.provideModule(DefaultRepositoryCacheManager.java:638)
at
org.apache.ivy.core.cache.ModuleDescriptorMemoryCache.getStale(ModuleDescriptorMemoryCache.java:68)
at
org.apache.ivy.core.cache.DefaultRepositoryCacheManager.getStaledMd(DefaultRepositoryCacheManager.java:655)
at
org.apache.ivy.core.cache.DefaultRepositoryCacheManager.cacheModuleDescriptor(DefaultRepositoryCacheManager.java:942)
at
org.apache.ivy.plugins.resolver.BasicResolver.parse(BasicResolver.java:542)
at
org.apache.ivy.plugins.resolver.BasicResolver.getDependency(BasicResolver.java:263)
at
org.apache.ivy.plugins.resolver.IBiblioResolver.getDependency(IBiblioResolver.java:501)
at
org.apache.ivy.plugins.resolver.ChainResolver.getDependency(ChainResolver.java:130)
at
org.apache.ivy.plugins.resolver.ChainResolver.getDependency(ChainResolver.java:130)
at org.apache.ivy.core.resolve.IvyNode.loadData(IvyNode.java:170)
at org.apache.ivy.core.resolve.VisitNode.loadData(VisitNode.java:274)
at
org.apache.ivy.core.resolve.ResolveEngine.fetchDependencies(ResolveEngine.java:671)
at
org.apache.ivy.core.resolve.ResolveEngine.doFetchDependencies(ResolveEngine.java:757)
at
org.apache.ivy.core.resolve.ResolveEngine.fetchDependencies(ResolveEngine.java:679)
at
org.apache.ivy.core.resolve.ResolveEngine.getDependencies(ResolveEngine.java:551)
at
org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:235)
at
org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:193)
at
org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:138)
at
org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:134)
at org.apache.ivy.Ivy.resolve(Ivy.java:473)
It seems that the DocumentBuilder created in
org.apache.ivy.util.XMLHelper.getDocBuilder(EntityResolver) is stored in a
static variable and only initialized once. Would it be possible to cache the
DocumentBuilderFactory rather then the DocumentBuilder? Doing this would allow
for parallel XML parsing. Additionally the entity resolver provided on the
first call is the only one used for the lifetime of the DocumentBuilder. I
don't know if this was intended, but the method signature does not seem to
suggest it.
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