#fixed code
                                public void execute()
        throws MojoExecutionException, MojoFailureException
    {

        Set childModules = PomHelper.getAllChildModules( getProject(), getLog() );

        PomHelper.removeMissingChildModules( getLog(), getProject(), childModules );

        Iterator i = childModules.iterator();

        MojoExecutionException pbe = null;

        while ( i.hasNext() )
        {
            String modulePath = (String) i.next();

            File moduleDir = new File( getProject().getBasedir(), modulePath );

            File moduleProjectFile;

            if ( moduleDir.isDirectory() )
            {
                moduleProjectFile = new File( moduleDir, "pom.xml" );
            }
            else
            {
                // i don't think this should ever happen... but just in case
                // the module references the file-name
                moduleProjectFile = moduleDir;
            }

            try
            {
                // the aim of this goal is to fix problems when the project cannot be parsed by Maven
                // so we have to parse the file by hand!
                StringBuffer childPom = readFile( moduleProjectFile );
                ModifiedPomXMLEventReader pom = newModifiedPomXER( childPom );
                Artifact parent = PomHelper.getProjectParent( pom, getHelper() );
                if ( parent == null )
                {
                    getLog().info( "Module: " + modulePath + " does not have a parent" );
                }
                else if ( !getProject().getGroupId().equals( parent.getGroupId() )
                    || !getProject().getArtifactId().equals( parent.getArtifactId() ) )
                {
                    getLog().info( "Module: " + modulePath + " does not use "
                        + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + " as its parent" );
                }
                else if ( getProject().getVersion().equals( parent.getVersion() ) )
                {
                    getLog().info( "Module: " + modulePath + " parent is "
                        + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":"
                        + getProject().getVersion() );
                }
                else
                {
                    getLog().info( "Module: " + modulePath + " parent was "
                        + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":" + parent.getVersion()
                        + ", now " + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":"
                        + getProject().getVersion() );
                    process( moduleProjectFile );
                }
            }
            catch ( XMLStreamException e )
            {
                getLog().debug( "Could not parse " + moduleProjectFile.getPath(), e );
                if ( pbe == null )
                {
                    // save this until we get to the end.
                    pbe = new MojoExecutionException( "Could not parse " + moduleProjectFile.getPath(), e );
                }
            }
            catch ( IOException e )
            {
                getLog().debug( "Could not parse " + moduleProjectFile.getPath(), e );
                if ( pbe == null )
                {
                    // save this until we get to the end.
                    pbe = new MojoExecutionException( "Could not parse " + moduleProjectFile.getPath(), e );
                }
            }
        }

        if ( pbe != null )
        {
            // ok, now throw the first one to blow up.
            throw pbe;
        }

    }
#vulnerable code 
                                public void execute()
        throws MojoExecutionException, MojoFailureException
    {

        Set childModules = getAllChildModules( getProject() );

        removeMissingChildModules( getProject(), childModules );

        Iterator i = childModules.iterator();

        MojoExecutionException pbe = null;

        while ( i.hasNext() )
        {
            String modulePath = (String) i.next();

            File moduleDir = new File( getProject().getBasedir(), modulePath );

            File moduleProjectFile;

            if ( moduleDir.isDirectory() )
            {
                moduleProjectFile = new File( moduleDir, "pom.xml" );
            }
            else
            {
                // i don't think this should ever happen... but just in case
                // the module references the file-name
                moduleProjectFile = moduleDir;
            }

            try
            {
                // the aim of this goal is to fix problems when the project cannot be parsed by Maven
                // so we have to parse the file by hand!
                StringBuffer childPom = readFile( moduleProjectFile );
                ModifiedPomXMLEventReader pom = newModifiedPomXER( childPom );
                Stack stack = new Stack();
                String path = "";
                String groupId = null;
                String artifactId = null;
                String version = null;
                Pattern pattern = Pattern.compile( "/project/parent/(groupId|artifactId|version)" );
                while ( pom.hasNext() )
                {
                    XMLEvent event = pom.nextEvent();
                    if ( event.isStartDocument() )
                    {
                        path = "";
                        stack.clear();
                    }
                    else if ( event.isStartElement() )
                    {
                        stack.push( path );

                        path = path + "/" + event.asStartElement().getName().getLocalPart();

                        if ( pattern.matcher( path ).matches() )
                        {
                            String text = pom.getElementText().trim();
                            if ( path.endsWith( "groupId" ) )
                            {
                                groupId = text;
                            }
                            else if ( path.endsWith( "artifactId" ) )
                            {
                                artifactId = text;
                            }
                            else if ( path.endsWith( "version" ) )
                            {
                                version = text;
                            }
                            path = (String) stack.pop();
                        }
                    }
                    else if ( event.isEndElement() )
                    {
                        if ( "/project/parent".equals( path ) )
                        {
                            getLog().info( "Module: " + modulePath );

                            if ( getProject().getGroupId().equals( groupId ) && getProject().getArtifactId().equals(
                                artifactId ) )
                            {

                                if ( getProject().getVersion().equals( version ) )
                                {
                                    getLog().info( "  Parent is "
                                        + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":"
                                        + getProject().getVersion() );
                                }
                                else
                                {
                                    getLog().info( "  Parent was "
                                        + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":" + version
                                        + ", now " + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + ":"
                                        + getProject().getVersion() );
                                    process( moduleProjectFile );
                                }
                            }
                            else
                            {
                                getLog().info( "  does not use "
                                    + ArtifactUtils.versionlessKey( getProject().getArtifact() ) + " as its parent" );
                            }
                        }
                        path = (String) stack.pop();
                    }
                }
            }
            catch ( XMLStreamException e )
            {
                getLog().debug( "Could not parse " + moduleProjectFile.getPath(), e );
                if ( pbe == null )
                {
                    // save this until we get to the end.
                    pbe = new MojoExecutionException( "Could not parse " + moduleProjectFile.getPath(), e );
                }
            }
            catch ( IOException e )
            {
                getLog().debug( "Could not parse " + moduleProjectFile.getPath(), e );
                if ( pbe == null )
                {
                    // save this until we get to the end.
                    pbe = new MojoExecutionException( "Could not parse " + moduleProjectFile.getPath(), e );
                }
            }
        }

        if ( pbe != null )
        {
            // ok, now throw the first one to blow up.
            throw pbe;
        }

    } 
                            #location 47 
                            #vulnerability type NULL_DEREFERENCE