tomcat7-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat7/run/RunMojo.java [124:151]:
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    protected File getDocBase()
        throws IOException
    {
        // https://issues.apache.org/jira/browse/MTOMCAT-239
        // when running a jar docBase doesn't exists so create a fake one
        if ( !warSourceDirectory.exists() )
        {
            // we create a temporary file in build.directory
            final File tempDocBase = createTempDirectory( new File( project.getBuild().getDirectory() ) );
            Runtime.getRuntime().addShutdownHook( new Thread()
            {
                @Override
                public void run()
                {
                    try
                    {
                        FileUtils.deleteDirectory( tempDocBase );
                    }
                    catch ( Exception e )
                    {
                        // we can consider as safe to ignore as it's located in build directory
                    }
                }
            } );
            return tempDocBase;
        }
        return warSourceDirectory;
    }
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tomcat8-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat8/run/RunMojo.java [153:180]:
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    protected File getDocBase()
        throws IOException
    {
        // https://issues.apache.org/jira/browse/MTOMCAT-239
        // when running a jar docBase doesn't exists so create a fake one
        if ( !warSourceDirectory.exists() )
        {
            // we create a temporary file in build.directory
            final File tempDocBase = createTempDirectory( new File( project.getBuild().getDirectory() ) );
            Runtime.getRuntime().addShutdownHook( new Thread()
            {
                @Override
                public void run()
                {
                    try
                    {
                        FileUtils.deleteDirectory( tempDocBase );
                    }
                    catch ( Exception e )
                    {
                        // we can consider as safe to ignore as it's located in build directory
                    }
                }
            } );
            return tempDocBase;
        }
        return warSourceDirectory;
    }
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