tomcat7-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat7/AbstractCatalinaMojo.java [152:239]:
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        try
        {
            invokeManager();
        }
        catch ( TomcatManagerException exception )
        {
            throw new MojoExecutionException(
                messagesProvider.getMessage( "AbstractCatalinaMojo.managerError", exception.getMessage() ) );
        }
        catch ( IOException exception )
        {
            throw new MojoExecutionException( messagesProvider.getMessage( "AbstractCatalinaMojo.managerIOError" ),
                                              exception );
        }
    }

    // ----------------------------------------------------------------------
    // Protected Methods
    // ----------------------------------------------------------------------

    /**
     * Invokes Tomcat manager when this Mojo is executed.
     *
     * @throws org.apache.maven.plugin.MojoExecutionException                 if there was a problem executing this goal
     * @throws org.apache.tomcat.maven.common.deployer.TomcatManagerException if the Tomcat manager request fails
     * @throws java.io.IOException                                            if an i/o error occurs
     */
    protected abstract void invokeManager()
        throws MojoExecutionException, TomcatManagerException, IOException;

    /**
     * Gets the Tomcat manager wrapper object configured for this goal.
     *
     * @return the Tomcat manager wrapper object
     * @throws org.apache.maven.plugin.MojoExecutionException if there was a problem obtaining the authentication details
     */
    protected TomcatManager getManager()
        throws MojoExecutionException
    {
        // lazily instantiate when config values have been injected
        if ( manager == null )
        {
            String userName;
            String password;

            if ( server == null )
            {
                // no server set, use defaults
                getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultAuth" ) );
                userName = DEFAULT_USERNAME;
                password = DEFAULT_PASSWORD;
            }
            else
            {
                // obtain authenication details for specified server from wagon
                AuthenticationInfo info = wagonManager.getAuthenticationInfo( server );
                if ( info == null )
                {
                    throw new MojoExecutionException(
                        messagesProvider.getMessage( "AbstractCatalinaMojo.unknownServer", server ) );
                }

                // derive username
                userName = info.getUserName();
                if ( userName == null )
                {
                    getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultUserName" ) );
                    userName = DEFAULT_USERNAME;
                }

                // derive password
                password = info.getPassword();
                if ( password == null )
                {
                    getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultPassword" ) );
                    password = DEFAULT_PASSWORD;
                }
            }

            // if userName/password are defined in the mojo or the cli they override
            if ( !StringUtils.isEmpty( this.username ) )
            {
                userName = this.username;
                password = this.password == null ? "" : this.password;
            }

            manager = new TomcatManager( url, userName, password, charset, settings.isInteractiveMode() );
            manager.setUserAgent( name + "/" + version );
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tomcat8-maven-plugin/src/main/java/org/apache/tomcat/maven/plugin/tomcat8/AbstractCatalinaMojo.java [131:221]:
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        try
        {
            invokeManager();
        }
        catch ( TomcatManagerException exception )
        {
            throw new MojoExecutionException(
                messagesProvider.getMessage( "AbstractCatalinaMojo.managerError", exception.getMessage() ) );
        }
        catch ( IOException exception )
        {
            throw new MojoExecutionException( messagesProvider.getMessage( "AbstractCatalinaMojo.managerIOError" ),
                                              exception );
        }
    }

    // ----------------------------------------------------------------------
    // Protected Methods
    // ----------------------------------------------------------------------

    /**
     * Invokes Tomcat manager when this Mojo is executed.
     *
     * @throws org.apache.maven.plugin.MojoExecutionException
     *                             if there was a problem executing this goal
     * @throws org.apache.tomcat.maven.common.deployer.TomcatManagerException
     *                             if the Tomcat manager request fails
     * @throws java.io.IOException if an i/o error occurs
     */
    protected abstract void invokeManager()
        throws MojoExecutionException, TomcatManagerException, IOException;

    /**
     * Gets the Tomcat manager wrapper object configured for this goal.
     *
     * @return the Tomcat manager wrapper object
     * @throws org.apache.maven.plugin.MojoExecutionException
     *          if there was a problem obtaining the authentication details
     */
    protected TomcatManager getManager()
        throws MojoExecutionException
    {
        // lazily instantiate when config values have been injected
        if ( manager == null )
        {
            String userName;
            String password;

            if ( server == null )
            {
                // no server set, use defaults
                getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultAuth" ) );
                userName = DEFAULT_USERNAME;
                password = DEFAULT_PASSWORD;
            }
            else
            {
                // obtain authenication details for specified server from wagon
                AuthenticationInfo info = wagonManager.getAuthenticationInfo( server );
                if ( info == null )
                {
                    throw new MojoExecutionException(
                        messagesProvider.getMessage( "AbstractCatalinaMojo.unknownServer", server ) );
                }

                // derive username
                userName = info.getUserName();
                if ( userName == null )
                {
                    getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultUserName" ) );
                    userName = DEFAULT_USERNAME;
                }

                // derive password
                password = info.getPassword();
                if ( password == null )
                {
                    getLog().debug( messagesProvider.getMessage( "AbstractCatalinaMojo.defaultPassword" ) );
                    password = DEFAULT_PASSWORD;
                }
            }

            // if userName/password are defined in the mojo or the cli they override
            if ( !StringUtils.isEmpty( this.username ) )
            {
                userName = this.username;
                password = this.password == null ? "" : this.password;
            }

            manager = new TomcatManager( url, userName, password, charset, settings.isInteractiveMode() );
            manager.setUserAgent( name + "/" + version );
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