Examples of org.apache.catalina.loader.WebappLoader

org.apache.catalina.loader.WebappLoader
Classloader implementation which is specialized for handling web applications in the most efficient way, while being Catalina aware (all accesses to resources are made through {@link org.apache.catalina.WebResourceRoot}). This class loader supports detection of modified Java classes, which can be used to implement auto-reload support.
This class loader is configured by adding the pathnames of directories, JAR files, and ZIP files with the addRepository() method, prior to calling start(). When a new class is required, these repositories will be consulted first to locate the class. If it is not present, the system class loader will be used instead. @author Craig R. McClanahan @author Remy Maucherat @version $Id: WebappLoader.java 1551238 2013-12-16 15:46:02Z markt $


        if( log.isDebugEnabled() )
            log.debug("Creating Loader with parent class loader '" +
                       parent + "'");


        WebappLoader loader = new WebappLoader(parent);
        return (loader);


    }

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        if (debug >= 1)
            logger.log("Creating Loader with parent class loader '" +
                       parent + "'");


        WebappLoader loader = new WebappLoader(parent);
        return (loader);


    }

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    private boolean isDefaultLoader(Loader loader) {


        if (!(loader instanceof WebappLoader)) {
            return (false);
        }
        WebappLoader wloader = (WebappLoader) loader;
        if ((wloader.getCheckInterval() != 15) ||
            (wloader.getDebug() != 0) ||
            (wloader.getDelegate() != false) ||
            !wloader.getLoaderClass().equals
             ("org.apache.catalina.loader.WebappClassLoader")) {
            return (false);
        }
        return (true);

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        if ( useSeparateTomcatClassLoader )
        {
            context.setParentClassLoader( getTomcatClassLoader() );
        }


        final WebappLoader webappLoader = createWebappLoader();


        if ( classLoaderClass != null )
        {
            webappLoader.setLoaderClass( classLoaderClass );
        }


        context.setLoader( webappLoader );
        File contextFile = getContextFile();
        if ( contextFile != null )

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    {
        if ( useSeparateTomcatClassLoader )
        {
            return ( isContextReloadable() )
                ? new ExternalRepositoriesReloadableWebappLoader( getTomcatClassLoader(), getLog() )
                : new WebappLoader( getTomcatClassLoader() );
        }


        return ( isContextReloadable() )
            ? new ExternalRepositoriesReloadableWebappLoader( Thread.currentThread().getContextClassLoader(), getLog() )
            : new WebappLoader( Thread.currentThread().getContextClassLoader() );
    }

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            {
                getLog().error( e );
                return;
            }
        }
        WebappLoader webappLoader = new WebappLoader( Thread.currentThread().getContextClassLoader() );
        Context context = container.createContext( contextPath, artifactWarDir.getAbsolutePath() );
        context.setLoader( webappLoader );


        File contextFile = contextXml != null ? contextXml : getContextFile();
        if ( contextFile != null )

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     */
    @Override
    protected WebappLoader createWebappLoader()
        throws IOException, MojoExecutionException
    {
        WebappLoader loader = super.createWebappLoader();
        if ( useSeparateTomcatClassLoader )
        {
            loader.setDelegate( delegate );
        }


        try
        {
            ClassLoaderEntriesCalculatorRequest request =
                new ClassLoaderEntriesCalculatorRequest().setDependencies( dependencies ).setLog(
                    getLog() ).setMavenProject( project ).setAddWarDependenciesInClassloader(
                    addWarDependenciesInClassloader ).setUseTestClassPath( useTestClasspath );
            ClassLoaderEntriesCalculatorResult classLoaderEntriesCalculatorResult =
                classLoaderEntriesCalculator.calculateClassPathEntries( request );
            List<String> classLoaderEntries = classLoaderEntriesCalculatorResult.getClassPathEntries();
            final List<File> tmpDirectories = classLoaderEntriesCalculatorResult.getTmpDirectories();


            Runtime.getRuntime().addShutdownHook( new Thread()
            {
                @Override
                public void run()
                {
                    for ( File tmpDir : tmpDirectories )
                    {
                        try
                        {
                            FileUtils.deleteDirectory( tmpDir );
                        }
                        catch ( IOException e )
                        {
                            // ignore
                        }
                    }
                }
            } );


            if ( classLoaderEntries != null )
            {
                for ( String classLoaderEntry : classLoaderEntries )
                {
                    loader.addRepository( classLoaderEntry );
                }
            }
            if ( additionalClasspathDirs != null && !additionalClasspathDirs.isEmpty() )
            {
                for ( String additionalClasspathDir : additionalClasspathDirs )
                {
                    if ( StringUtils.isNotBlank( additionalClasspathDir ) )
                    {
                        File file = new File( additionalClasspathDir );
                        if ( file.exists() )
                        {
                            String fileUri = file.toURI().toString();
                            getLog().debug( "add file:" + fileUri + " as a additionalClasspathDir" );
                            loader.addRepository( fileUri );
                        }
                    }
                }
            }
        }

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     */
    @Override
    protected WebappLoader createWebappLoader()
        throws IOException, MojoExecutionException
    {
        WebappLoader loader = super.createWebappLoader();
        if ( useSeparateTomcatClassLoader )
        {
            loader.setDelegate( delegate );
        }


        try
        {
            ClassLoaderEntriesCalculatorRequest request =
                new ClassLoaderEntriesCalculatorRequest().setDependencies( dependencies ).setLog(
                    getLog() ).setMavenProject( project ).setAddWarDependenciesInClassloader(
                    addWarDependenciesInClassloader ).setUseTestClassPath( useTestClasspath );
            ClassLoaderEntriesCalculatorResult classLoaderEntriesCalculatorResult =
                classLoaderEntriesCalculator.calculateClassPathEntries( request );
            List<String> classLoaderEntries = classLoaderEntriesCalculatorResult.getClassPathEntries();
            final List<File> tmpDirectories = classLoaderEntriesCalculatorResult.getTmpDirectories();


            Runtime.getRuntime().addShutdownHook( new Thread()
            {
                @Override
                public void run()
                {
                    for ( File tmpDir : tmpDirectories )
                    {
                        try
                        {
                            FileUtils.deleteDirectory( tmpDir );
                        }
                        catch ( IOException e )
                        {
                            // ignore
                        }
                    }
                }
            } );


            if ( classLoaderEntries != null )
            {
                for ( String classLoaderEntry : classLoaderEntries )
                {
                    loader.addRepository( classLoaderEntry );
                }
            }


            if ( additionalClasspathDirs != null && !additionalClasspathDirs.isEmpty() )
            {
                for ( String additionalClasspathDir : additionalClasspathDirs )
                {
                    if ( StringUtils.isNotBlank( additionalClasspathDir ) )
                    {
                        File file = new File( additionalClasspathDir );
                        if ( file.exists() )
                        {
                            String fileUri = file.toURI().toString();
                            getLog().debug( "add file:" + fileUri + " as a additionalClasspathDir" );
                            loader.addRepository( fileUri );
                        }
                    }
                }
            }
        }

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        if ( useSeparateTomcatClassLoader )
        {
            context.setParentClassLoader( getTomcatClassLoader() );
        }


        final WebappLoader loader = createWebappLoader();


        context.setLoader( loader );


        if ( overriddenContextFile != null )
        {
            // here, send file to Tomcat for it to complain if missing
            context.setConfigFile( overriddenContextFile.toURI().toURL() );
        }
        else if ( defaultContextFile.exists() )
        {
            // here, only sending default file if it indeed exists
            // otherwise Tomcat will create a default context
            context.setConfigFile( defaultContextFile.toURI().toURL() );
        }


        if ( classLoaderClass != null )
        {
            loader.setLoaderClass( classLoaderClass );
        }


        return context;


    }

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    {
        if ( useSeparateTomcatClassLoader )
        {
            return ( isContextReloadable() )
                ? new ExternalRepositoriesReloadableWebappLoader( getTomcatClassLoader(), getLog() )
                : new WebappLoader( getTomcatClassLoader() );
        }


        return ( isContextReloadable() )
            ? new ExternalRepositoriesReloadableWebappLoader( Thread.currentThread().getContextClassLoader(), getLog() )
            : new WebappLoader( Thread.currentThread().getContextClassLoader() );
    }

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