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

[Martin Mucha]

----- Original Message -----
> 
> 
> On Wed, Apr 6, 2016 at 6:03 PM, Juan Hernández < jhernand at redhat.com > wrote:
> 
> 
> 
> On 04/06/2016 11:51 AM, Kai Kang wrote:
> > 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.
> > 
> 
> The version of JAXB used by that area of the code is the version of JAXB
> included in the JDK that you are using for the build. So the question is
> what version of the JDK are you using?
> 
> Hi Juan,
> 
> I am using icedtea7 to build openjdk-7. And I found the JAXB file.

note: I saw same line using java-1.8.0-openjdk installed from repo. 

> 
> Would you like to give some advice how to debug this issue? Does jdb could
> debug such code?
> 
> Thanks a lot.
> 
> --Kai
> 
> 
> 
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