Error when run in Eclipse in Mac

Hi folks,

When run in Eclipse an GWT application show me an error (only in a Mac). This error I can fix in maven when add xercesImpl 2.9.1 as depedency in the project and in the plugins. But in eclipse I don't know how resolve.

Enviroment:

Apache Maven 2.2.1 (r801777; 2009-08-06 16:16:01-0300) 
Java version: 1.6.0_24 
Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home 
Default locale: en_US, platform encoding: MacRoman 
OS name: "mac os x" version: "10.6.8" arch: "i386" Family: "mac" 

Error:

2011-06-29 00:04:22.908 java[20592:903] [Java CocoaComponent compatibility mode]: Enabled
2011-06-29 00:04:22.912 java[20592:903] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000
[WARN] Unable to process 'file:/Users/XXXX/WEB-INF/web.xml' for servlet validation
org.xml.sax.SAXNotRecognizedException: unrecognized feature http://apache.org/xml/features/nonvalidating/load-external-dtd
    at org.gjt.xpp.sax2.Driver.setFeature(Driver.java:178)
    at org.gjt.xpp.jaxp11.SAXParserImpl.setFeatures(SAXParserImpl.java:149)
    at org.gjt.xpp.jaxp11.SAXParserImpl.<init>(SAXParserImpl.java:132)
    at org.gjt.xpp.jaxp11.SAXParserFactoryImpl.newSAXParserImpl(SAXParserFactoryImpl.java:114)
    at org.gjt.xpp.jaxp11.SAXParserFactoryImpl.setFeature(SAXParserFactoryImpl.java:142)
    at com.google.gwt.dev.ServletValidator.create(ServletValidator.java:188)
    at com.google.gwt.dev.ServletValidator.create(ServletValidator.java:172)
    at com.google.gwt.dev.DevMode.doStartup(DevMode.java:426)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1045)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
    at com.google.gwt.dev.DevMode.main(DevMode.java:309)
Loading modules
   gov.senasa.embalajemadera.EmbalajeMadera
      [ERROR] Failure while parsing XML
org.xml.sax.SAXNotRecognizedException: unrecognized feature http://apache.org/xml/features/nonvalidating/load-external-dtd
    at org.gjt.xpp.sax2.Driver.setFeature(Driver.java:178)
    at org.gjt.xpp.jaxp11.SAXParserImpl.setFeatures(SAXParserImpl.java:149)
    at org.gjt.xpp.jaxp11.SAXParserImpl.<init>(SAXParserImpl.java:132)
    at org.gjt.xpp.jaxp11.SAXParserFactoryImpl.newSAXParserImpl(SAXParserFactoryImpl.java:114)
    at org.gjt.xpp.jaxp11.SAXParserFactoryImpl.setFeature(SAXParserFactoryImpl.java:142)
    at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:324)
    at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$100(ReflectiveParser.java:48)
    at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:402)
    at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:280)
    at com.google.gwt.dev.cfg.ModuleDefLoader$1.load(ModuleDefLoader.java:192)
    at com.google.gwt.dev.cfg.ModuleDefLoader.doLoadModule(ModuleDefLoader.java:308)
    at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(ModuleDefLoader.java:151)
    at com.google.gwt.dev.DevModeBase.loadModule(DevModeBase.java:979)
    at com.google.gwt.dev.DevMode.loadModule(DevMode.java:548)
    at com.google.gwt.dev.DevMode.doStartup(DevMode.java:436)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1045)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
    at com.google.gwt.dev.DevMode.main(DevMode.java:309)
      [ERROR] Unexpected error while processing XML
com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries)
    at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:355)
    at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$100(ReflectiveParser.java:48)
    at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:402)
    at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:280)
    at com.google.gwt.dev.cfg.ModuleDefLoader$1.load(ModuleDefLoader.java:192)
    at com.google.gwt.dev.cfg.ModuleDefLoader.doLoadModule(ModuleDefLoader.java:308)
    at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(ModuleDefLoader.java:151)
    at com.google.gwt.dev.DevModeBase.loadModule(DevModeBase.java:979)
    at com.google.gwt.dev.DevMode.loadModule(DevMode.java:548)
    at com.google.gwt.dev.DevMode.doStartup(DevMode.java:436)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1045)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
    at com.google.gwt.dev.DevMode.main(DevMode.java:309)
[ERROR] shell failed in doStartup method

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