[ovirt-devel] How to debug NullPointerException for project restapi-def inition of version 3.6.4.1?

Hi, I am building ovirt-engine 3.6.4.1 and failed with NullPointerException. I build for cross compile with commands: tmp_repo=/buildarea3/kkang/builds/Mar31-ovrit-engine/bitbake_build/tmp/work/corei7-64-wrs-linux/ovirt-engine/3.6.4.1-r0/repo export MAVEN_OPTS="-Dmaven.repo.local=$tmp_repo" make EXTRA_BUILD_FLAGS="-s /buildarea3/kkang/builds/Mar31-ovrit-engine/bitbake_build/tmp/work/corei7-64-wrs-linux/ovirt-engine/3.6.4.1-r0/settings.xml --debug --offline" -j1 BUILD_GWT=1 BUILD_LOCALES=0 BUILD_UT=1 BUILD_VALIDATION=0 JAVA_DIR=/usr/share/ovirt-engine/java LOCALSTATE_DIR=/var MAVENPOM_DIR=/usr/share/ovirt-engine/maven-poms PREFIX=/usr SYSCONF_DIR=/etc PKG_SYSCONF_DIR=/etc/ovirt-engine PKG_DOC_DIR=/usr/doc/ovirt-engine PKG_EAR_DIR=/usr/share/ovirt-engine/engine.ear PKG_PKI_DIR=/etc/pki/ovirt-engine PKG_JBOSS_MODULES=/usr/share/ovirt-engine/modules PKG_CACHE_DIR=/var/cache/ovirt-engine PKG_LOG_DIR=/var/log/ovirt-engine PKG_TMP_DIR=/var/tmp/ovirt-engine PKG_STATE_DIR=/var/lib/ovirt-engine PKG_USER=ovirt PKG_GROUP=ovirt all The error messages show: [INFO] oVirt Engine API Definition ....................... FAILURE [1.476s] ... [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:java (default) on project restapi-definition: An exception occured while executing the Java class. null: InvocationTargetException: NullPointerException -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:java (default) on project restapi-definition: An exception occured while executing the Java class. null at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216) ... at javax.xml.bind.JAXB.marshal(JAXB.java:332) at org.ovirt.engine.api.rsdl.RsdlManager.serializeRsdl(RsdlManager.java:134) at org.ovirt.engine.api.rsdl.RsdlManager.generateRsdlFile(RsdlManager.java:84) at org.ovirt.engine.api.rsdl.RsdlManager.main(RsdlManager.java:58) ... 6 more My questions are: 1 I know the error occurs in file backend/manager/modules/restapi/interface/definition/src/main/java/org/ovirt/engine/api/rsdl/RsdlManager.java, but how to debug it? 2 When I remove pom and jar files of javax.xml.bind.JAXB in mave repo with offline mode, it still could find the class. Which javax.xml.bind.JAXB is used? I searched the ovirt engine repo but didn't find it either. Thanks a lot. --Kai