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NetBeans GUI designer cannot find SwingX classes

I was thrown into an existing software development project that uses Maven in a NetBeans Java project .

I pulled the source from the blissful git repository into the newly installed NetBeans 8. If I build it and run it, it starts. :-)

I need to edit the GUI of a program created with the NetBeans GUI generator. If I try to open the GUI editor, it always marks some components extends JXPanel

as invalid due to the following error:

java.lang.NoClassDefFoundError: org / jdesktop / swingx / JXPanel ... thrown by java.lang.ClassNotFoundException: org.jdesktop.swingx.JXPanel

I just don't get it - the swingx-1.6.jar and swingx-beaninfo-1.6.jar files are in the Dependencies section of the project (without the "!"), I added them to the Library Manager and I added them to the Palette. The program starts, but why, why, why can't the NetBeans GUI editor find the classes?

What am I doing wrong?

Below is a snippet of the pom.xml:

<dependency>
    <groupId>org.jdesktop</groupId>
    <artifactId>swingx</artifactId>
    <version>1.6</version>
    <scope>system</scope>
    <systemPath>${basedir}/lib/swingx-1.6.jar</systemPath>
</dependency>
<dependency>
    <groupId>org.jdesktop</groupId>
    <artifactId>swingx.beaninfo</artifactId>
    <scope>system</scope>
    <version>1.6</version>
    <systemPath>${basedir}/lib/swingx-beaninfo-1.6.jar</systemPath>
</dependency>
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2 answers


I have now fixed that - thanks to @Asprise Support, which pushed me in the right direction.

The problem is that matisse cannot handle the entries <systemPath>${basedir}/...

in the pom.xml.

So the only thing to do is download the dependencies from the repository. If they are already in a repository of some kind: great. If not, create your own local file and refer to it:

  • Create a repository directory in your project like maven-repo

  • Expand the banks into it: mvn deploy:deploy-file -Durl=file://<absolute-path-to-repo> -Dfile=<path-to-jar> -DgroupId=<groupId-from-pom.xml> -DartifactId=<artifactId-from-pom.xml> -Dpackaging=jar -Dversion=<version-from-pom.xml>

  • Add new repository to pom.xml:

    <repositories>
    <repository>
        <id>someGreatName</id>
        <url>file://${basedir}/theNameOfYourRepositoryFolder</url>
    </repository>
</repositories>


(The last two steps are taken from https://devcenter.heroku.com/articles/local-maven-dependencies )

  1. To be sure, delete your local Maven cache located in ~/.m2/repository

    orC:\Users\<yourUserName>\.m2\repository

  2. Run the application to have Maven download all dependencies.

Matisse should work now - it doesn't understand new ${basedir}

in pom.xml, but Maven does, and Matisse gets Maven cache dependencies after (imho).

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I would suggest using swingx from maven central repository instead of local copy - I suspect there is a bug, or the GUI editor cannot resolve $ {basedir}. Here's my setup and it works well:

<dependencies>
    <dependency>
        <groupId>org.swinglabs.swingx</groupId>
        <artifactId>swingx-all</artifactId>
        <version>1.6.5</version>
    </dependency>
</dependencies>

and the corresponding Java class:



public class NewJFrame extends javax.swing.JFrame {

/**
 * Creates new form NewJFrame
 */
public NewJFrame() {
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {

    jXPanel1 = new org.jdesktop.swingx.JXPanel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jXPanel1.setBackground(new java.awt.Color(153, 204, 255));

    javax.swing.GroupLayout jXPanel1Layout = new javax.swing.GroupLayout(jXPanel1);
    jXPanel1.setLayout(jXPanel1Layout);
    jXPanel1Layout.setHorizontalGroup(
        jXPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 259, Short.MAX_VALUE)
    );
    jXPanel1Layout.setVerticalGroup(
        jXPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 171, Short.MAX_VALUE)
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jXPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(131, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jXPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(118, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>//GEN-END:initComponents

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}

// Variables declaration - do not modify//GEN-BEGIN:variables
private org.jdesktop.swingx.JXPanel jXPanel1;
// End of variables declaration//GEN-END:variables

}

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