一直报空指针异常啊

Exception in thread "main" java.lang.NullPointerException

at com.sun.org.apache.xml.internal.serializer.ToStream.writeAttrString(ToStream.java:1962)

at com.sun.org.apache.xml.internal.serializer.ToStream.processAttributes(ToStream.java:1942)

at com.sun.org.apache.xml.internal.serializer.ToStream.endElement(ToStream.java:2031)

at com.sun.org.apache.xml.internal.serializer.ToUnknownStream.endElement(ToUnknownStream.java:827)

at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.endElement(TransformerHandlerImpl.java:273)

at com.xml.sax.SAXTest.creatXML(SAXTest.java:134)

at com.xml.sax.SAXTest.main(SAXTest.java:36)

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2

JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [../../../src/share/back/util.c:820]

一直报这个错误