Netbeans Tomcat HOME check - see: https://twitter.com/speakjava/status/1202692785155035137 --- https://twitter.com/lamitpobus/status/1203312117560070144?s=20

.gitignore

build/

compile.sh

#!/bin/bash

NB_HOME=~/bin/netbeans.11.2
NB_LIB=$NB_HOME/enterprise/modules

[ ! -d build ] && mkdir build

javac -cp $NB_LIB/ext/jsr88javax.jar:\
$NB_LIB/org-netbeans-modules-tomcat5.jar \
 	-d build \
	Main.java WizardCheck.java

Main.java

package sub.optimal;

import java.io.File;
import org.netbeans.modules.tomcat5.TomcatFactory;

public class Main {
    public static void main(String[] args) {
        File catalinaHome = new File(args[0]);
        String version = TomcatFactory.getTomcatVersionString(catalinaHome);
        System.out.println("version = " + version);
    }
}

run-main.sh

#!/bin/bash

NB_HOME=~/bin/netbeans.11.2
NB_LIB=$NB_HOME/enterprise/modules

TOMCAT_5_HOME=/tmp/apache-tomcat-5.5.36
TOMCAT_8_HOME=/tmp/apache-tomcat-8.5.49

echo "### Netbeans classpath"
java -cp build:\
$NB_LIB/ext/jsr88javax.jar:\
$NB_LIB/org-netbeans-modules-tomcat5.jar \
	sub.optimal.Main $TOMCAT_8_HOME

echo
echo "### classpath with hidden Tomcat 5 libs"
java -cp build:\
$TOMCAT_5_HOME/server/lib/catalina.jar:\
$NB_LIB/ext/jsr88javax.jar:\
$NB_LIB/org-netbeans-modules-tomcat5.jar \
	sub.optimal.Main $TOMCAT_8_HOME

run-wizardcheck-tc5.sh

#!/bin/bash

TOMCAT_5_HOME=/tmp/apache-tomcat-5.5.36
NB_HOME=~/bin/netbeans.11.2

echo "### classpath with hidden Tomcat 5 libs"
java -cp build:\
$TOMCAT_5_HOME/server/lib/catalina.jar:\
$NB_HOME/enterprise/modules/ext/jsr88javax.jar:\
$NB_HOME/java/modules/org-netbeans-modules-form.jar:\
$NB_HOME/ide/modules/org-netbeans-modules-schema2beans.jar:\
$NB_HOME/enterprise/modules/org-netbeans-modules-tomcat5.jar:\
$NB_HOME/platform/modules/org-openide-awt.jar:\
$NB_HOME/platform/modules/org-openide-loaders.jar:\
$NB_HOME/platform/modules/org-openide-nodes.jar:\
$NB_HOME/platform/lib/org-openide-util.jar:\
$NB_HOME/platform/lib/org-openide-util-lookup.jar:\
$NB_HOME/platform/lib/org-openide-util-ui.jar \
	org.netbeans.modules.tomcat5.ui.wizard.WizardCheck

run-wizardcheck.sh

#!/bin/bash

NB_HOME=~/bin/netbeans.11.2

echo "### Netbeans classpath"
java -cp build:\
$NB_HOME/enterprise/modules/ext/jsr88javax.jar:\
$NB_HOME/java/modules/org-netbeans-modules-form.jar:\
$NB_HOME/ide/modules/org-netbeans-modules-schema2beans.jar:\
$NB_HOME/enterprise/modules/org-netbeans-modules-tomcat5.jar:\
$NB_HOME/platform/modules/org-openide-awt.jar:\
$NB_HOME/platform/modules/org-openide-loaders.jar:\
$NB_HOME/platform/modules/org-openide-nodes.jar:\
$NB_HOME/platform/lib/org-openide-util.jar:\
$NB_HOME/platform/lib/org-openide-util-lookup.jar:\
$NB_HOME/platform/lib/org-openide-util-ui.jar \
	org.netbeans.modules.tomcat5.ui.wizard.WizardCheck

tomcat5_lib_in_classpath.png

WizardCheck.java

package org.netbeans.modules.tomcat5.ui.wizard;

import java.awt.HeadlessException;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
import org.netbeans.modules.tomcat5.TomcatFactory;

public class WizardCheck {

    static final Logger LOGGER = Logger.getGlobal();
    private static final Class<TomcatFactory> TOMCAT_FACTORY = TomcatFactory.class;
    private static final Class<InstallPanelVisual> INSTALL_PANEL_VISUAL = InstallPanelVisual.class;
    private InstallPanelVisual component;
    private Method getTomcatVersionFallback;
    private Field jTextFieldHomeDir;

    public static void main(String[] args) throws NoSuchMethodException, SecurityException, NoSuchFieldException {
        new WizardCheck().execute();
    }

    private void execute() throws SecurityException, NoSuchMethodException, HeadlessException, NoSuchFieldException {
        System.setProperty("java.util.logging.SimpleFormatter.format", "[%1$tT] [%4$-7s] %5$s %n");
        LOGGER.setLevel(Level.ALL);
        initReflection();
        component = new InstallPanelVisual();
        component.addChangeListener((e) -> {
            LOGGER.log(Level.SEVERE, "getErrorMessage: {0}", component.getErrorMessage());
            this.showVersions(component.getHomeDir());
        });
        JFrame frame = new JFrame();
        frame.add(component);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.pack();
    }

    private void showVersions(File catalinaHome) {
        printHomeDir();
        printTomcatVersionString(catalinaHome);
    }

    private void printTomcatVersionString(File catalinaHome) {
        // logic extracted from InstallPanelVisaul.fireChange
        try {
            String version = TomcatFactory.getTomcatVersionString(catalinaHome);
            LOGGER.log(Level.INFO, "getTomcatVersionString: {0}", version);
        } catch (IllegalStateException e) {
            LOGGER.log(Level.INFO, "getTomcatVersionString: {0}", e.getMessage());
            try {
                // this branch is executed when class 'org.apache.catalina.util.ServerInfo'
                // is not found
                // see:  TomcatVersion.getTomcatVersion
                String version = (String) getTomcatVersionFallback.invoke(TOMCAT_FACTORY, catalinaHome);
                LOGGER.log(Level.INFO, "getTomcatVersionFallback: {0}", version);
            } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
                LOGGER.log(Level.INFO, "getTomcatVersionFallback: {0}", ex.getMessage());
            }
        }
    }

    private void printHomeDir() {
        try {
            JTextField homeDir = (JTextField) jTextFieldHomeDir.get(component);
            LOGGER.log(Level.INFO, "jTextFieldHomeDir: [{0}]", homeDir.getText());
        } catch (IllegalAccessException | IllegalArgumentException ex) {
            LOGGER.log(Level.INFO, "jTextFieldHomeDir: {0}", ex.getMessage());
        }
    }

    private void initReflection() throws NoSuchMethodException, SecurityException, NoSuchFieldException {
        getTomcatVersionFallback = TOMCAT_FACTORY.getDeclaredMethod("getTomcatVersionFallback", File.class);
        getTomcatVersionFallback.setAccessible(true);
        jTextFieldHomeDir = INSTALL_PANEL_VISUAL.getDeclaredField("jTextFieldHomeDir");
        jTextFieldHomeDir.setAccessible(true);
    }
}