在用Spock + PowerMock 模拟静态方法时，遇到如下报错：
javax.xml.parsers.FactoryConfigurationError: Provider com.sun.org.apache.xerces.internal.jaxp.documentBuilderFactoryImpl could not be instantiated: java.lang.ClassCastException: com.sun.org.apache.xerces.internal.jaxp.documentBuilderFactoryImpl cannot be cast to javax.xml.parsers.documentBuilderFactory at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:204) at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:152) at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:277) at javax.xml.parsers.documentBuilderFactory.newInstance(documentBuilderFactory.java:120) at org.apache.logging.log4j.core.config.xml.XmlConfiguration.newdocumentBuilder(XmlConfiguration.java:183) at org.apache.logging.log4j.core.config.xml.XmlConfiguration.解决方法(XmlConfiguration.java:89) at org.apache.logging.log4j.core.config.xml.XmlConfigurationFactory.getConfiguration(XmlConfigurationFactory.java:46) at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:517) at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:492) at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:405) at org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(ConfigurationFactory.java:323) at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:687) at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:708) at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:263) at org.apache.logging.log4j.core.async.AsyncLoggerContext.start(AsyncLoggerContext.java:76) at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153) at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45) at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:138) at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:45) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:48) at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:30) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358) at org.slf4j.LoggerFactory$getLogger.call(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127) at com.athaydes.spockframework.report.SpockReportExtension. (SpockReportExtension.groovy) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at org.spockframework.runtime.GlobalExtensionRegistry.instantiateGlobalExtension(GlobalExtensionRegistry.java:88) at org.spockframework.runtime.GlobalExtensionRegistry.initializeGlobalExtensions(GlobalExtensionRegistry.java:58) at org.spockframework.runtime.RunContext.start(RunContext.java:56) at org.spockframework.runtime.RunContext.get(RunContext.java:166) at org.spockframework.runtime.Sputnik.runExtensionsIfNecessary(Sputnik.java:90) at org.spockframework.runtime.Sputnik.getDescription(Sputnik.java:54) at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner.getDescription(DelegatingPowerMockRunner.java:164) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.getDescription(JUnit4TestSuiteChunkerImpl.java:194) at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.getDescription(AbstractCommonPowerMockRunner.java:51) at org.junit.runners.model.RunnerBuilder.configureRunner(RunnerBuilder.java:81) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:72) at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:37) at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:57) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70) at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolveTestClass(ClassSelectorResolver.java:66) at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolve(ClassSelectorResolver.java:47) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:134) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1361) at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:499) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:486) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:185) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:125) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:91) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:82) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113) at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:44) at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:63) at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:181) at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:168) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) Caused by: java.lang.ClassCastException: com.sun.org.apache.xerces.internal.jaxp.documentBuilderFactoryImpl cannot be cast to javax.xml.parsers.documentBuilderFactory at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:190) ... 72 more
在报错单元测试类上加上此句注解即可：
@PowerMockIgnore(["org.w3c.dom.*", "javax.xml.*", "org.xml.*"])
