tomcat7-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat7/run/AbstractRunMojo.java [1381:1402]:
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    private void setupSystemProperties()
    {
        if ( systemProperties != null && !systemProperties.isEmpty() )
        {
            getLog().info( "setting SystemProperties:" );

            for ( String key : systemProperties.keySet() )
            {
                String value = systemProperties.get( key );

                if ( value != null )
                {
                    getLog().info( " " + key + "=" + value );
                    System.setProperty( key, value );
                }
                else
                {
                    getLog().info( "skip sysProps " + key + " with empty value" );
                }
            }
        }
    }
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tomcat8-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat8/run/AbstractRunMojo.java [1452:1473]:
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    private void setupSystemProperties()
    {
        if ( systemProperties != null && !systemProperties.isEmpty() )
        {
            getLog().info( "setting SystemProperties:" );

            for ( String key : systemProperties.keySet() )
            {
                String value = systemProperties.get( key );

                if ( value != null )
                {
                    getLog().info( " " + key + "=" + value );
                    System.setProperty( key, value );
                }
                else
                {
                    getLog().info( "skip sysProps " + key + " with empty value" );
                }
            }
        }
    }
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