错误： com.sun.org.apache.xerces.internal.impl.dv.xs.SchemaDVFactoryImpl does not extend from SchemaDVFactory

问题背景

发现单元测试覆盖率不够，在检查Sonar日志时有下面的错误，导致相关的单元测试覆盖率不够

Sonar 日志：

 16:50:09  com.sun.org.apache.xerces.internal.impl.dv.DVFactoryException: Schema factory class  com.sun.org.apache.xerces.internal.impl.dv.xs.SchemaDVFactoryImpl does  not extend from SchemaDVFactory.
 16:50:09  	at com.sun.org.apache.xerces.internal.impl.dv.SchemaDVFactory.getInstance(SchemaDVFactory.java:75) ~[?:1.8.0_282]
 16:50:09  	at com.sun.org.apache.xerces.internal.impl.dv.SchemaDVFactory.getInstance(SchemaDVFactory.java:57) ~[?:1.8.0_282]
 16:50:09  	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.reset(XMLSchemaLoader.java:1024) ~[?:1.8.0_282]
 16:50:09  	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:556) ~[?:1.8.0_282]
 16:50:09  	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:535) ~[?:1.8.0_282]
 16:50:09  	at  com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema(XMLSchemaFactory.java:254) ~[?:1.8.0_282]
 16:50:09  	at javax.xml.validation.SchemaFactory.newSchema(SchemaFactory.java:638) ~[?:1.8.0_282]
 16:50:09  	at org.opensaml.xml.XMLConfigurator.(XMLConfigurator.java:93) ~[xmltooling-1.4.4.jar:1.4.4]
 16:50:09  	at org.opensaml.xml.XMLConfigurator.(XMLConfigurator.java:74) ~[xmltooling-1.4.4.jar:1.4.4]
 16:50:09  	at org.opensaml.DefaultBootstrap.initializeXMLTooling(DefaultBootstrap.java:220) ~[opensaml-2.6.4.jar:2.6.4]
 16:50:09  	at org.opensaml.DefaultBootstrap.initializeXMLTooling(DefaultBootstrap.java:207) ~[opensaml-2.6.4.jar:2.6.4]
 16:50:09  	at org.opensaml.DefaultBootstrap.bootstrap(DefaultBootstrap.java:100) ~[opensaml-2.6.4.jar:2.6.4]

错误抛出的地方是因为代码中使用了DefaultBootstrap.bootstrap();

解决办法

在单元测试类头部@PowerMockIgnore增加"com.sun.org.apache.xerces.*" ，忽略该包

@PowerMockIgnore({"javax.management.*","org.*","javax.xml.*","com.sun.org.apache.xerces.*"})