I have a project created with help of GUI designer. Here is code of main form.
public class MainForm {
MainForm() {
directLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
}
}
});
crossLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
saveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
}
public JPanel getMainPanel() {
return mainPanel;
}
private void createUIComponents() {
drawingPanel = new DrawingPanel();
}
private JPanel mainPanel;
private JComboBox directDirectionCombobox;
private JButton directLineOkButton;
private JButton crossLineOkButton;
private JComboBox crossLineComboBox;
private JTextField crossLineSizeValue;
private JButton clearButton;
private JLabel directLineLabel;
private JPanel directLinePanel;
private JLabel crossLineLabel;
private JPanel crossLinePanel;
private JPanel okClearButtonPanel;
private JTextField directLineSizeValue;
private JButton saveButton;
private JPanel drawingPanel;
private JButton cancelButton;
}
It works fine. Jar file generates fine, here code of pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>DOC</groupId>
<artifactId>DOC</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
</project>
But when I try to run jar file there is a mistake.
Exception in thread "main" java.lang.NullPointerException
at MainForm.<init>(MainForm.java:14)
at Main.main(Main.java:13)
It show that mistake is at the line where directLineOkButton listener is created. I create listener like said here: http://www.jetbrains.com/idea/training/demos/GUI_Designer/GUI_Designer.html in constructor using cmd+o. Here is code of xml of form:
<?xml version="1.0" encoding="UTF-8"?>
<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="MainForm">
<grid id="27dc6" binding="mainPanel" layout-manager="FormLayout">
<rowspec value="center:23px:noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:47px:noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<rowspec value="top:7dlu:noGrow"/>
<rowspec value="center:25px:noGrow"/>
<rowspec value="top:174dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<colspec value="fill:d:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:452px:noGrow"/>
<constraints>
<xy x="20" y="20" width="797" height="453"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="3b663" class="javax.swing.JLabel" binding="directLineLabel">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Direct Line"/>
</properties>
</component>
<grid id="499e0" binding="directLinePanel" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:98px:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:80px:grow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="1" column="0" row-span="2" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="c383d" class="javax.swing.JComboBox" binding="directDirectionCombobox">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<enabled value="true"/>
<model>
<item value="Вверх"/>
<item value="Вниз"/>
<item value="Вправо"/>
<item value="Влево"/>
</model>
</properties>
</component>
<component id="17aa1" class="javax.swing.JTextField" binding="directLineSizeValue">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="6" anchor="8" fill="1" indent="0" use-parent-layout="false">
<preferred-size width="150" height="-1"/>
</grid>
<forms defaultalign-horz="false"/>
</constraints>
<properties/>
</component>
<component id="44fc7" class="javax.swing.JButton" binding="directLineOkButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="OK"/>
</properties>
</component>
</children>
</grid>
<component id="5a571" class="javax.swing.JLabel" binding="crossLineLabel">
<constraints>
<grid row="4" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Cross Line"/>
</properties>
</component>
<grid id="77f1a" binding="crossLinePanel" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:98px:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:80px:grow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="6" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="32368" class="javax.swing.JComboBox" binding="crossLineComboBox">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<model>
<item value="Вверх-вправо"/>
<item value="Вверх-влево"/>
<item value="Вниз-вправо"/>
<item value="Вниз-влево"/>
</model>
</properties>
</component>
<component id="dbf23" class="javax.swing.JTextField" binding="crossLineSizeValue">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="6" anchor="8" fill="1" indent="0" use-parent-layout="false">
<preferred-size width="150" height="-1"/>
</grid>
<forms defaultalign-horz="false"/>
</constraints>
<properties/>
</component>
<component id="c5c8a" class="javax.swing.JButton" binding="crossLineOkButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="OK"/>
</properties>
</component>
</children>
</grid>
<grid id="53bbc" binding="okClearButtonPanel" layout-manager="FormLayout">
<rowspec value="center:d:noGrow"/>
<colspec value="fill:d:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="8" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<enabled value="false"/>
</properties>
<border type="none"/>
<children>
<component id="41ba7" class="javax.swing.JButton" binding="saveButton">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Сохранить"/>
</properties>
</component>
<component id="a6bf6" class="javax.swing.JButton" binding="clearButton">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Очистить"/>
</properties>
</component>
<component id="40f1c" class="javax.swing.JButton" binding="cancelButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Отменить"/>
</properties>
</component>
</children>
</grid>
<grid id="2e94e" binding="drawingPanel" custom-create="true" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:d:grow"/>
<constraints>
<grid row="0" column="2" row-span="11" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<background color="-1"/>
</properties>
<border type="none"/>
<children/>
</grid>
</children>
</grid>
</form>
You must include ideauidesigner-maven-plugin:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>ideauidesigner-maven-plugin</artifactId>
<version>1.0-beta-1</version>
<executions>
<execution>
<goals>
<goal>javac2</goal>
</goals>
</execution>
</executions>
<configuration>
<fork>true</fork>
<debug>true</debug>
<failOnError>true</failOnError>
</configuration>
</plugin>
</plugins>
</build>
and optionally - if you use GridLayoutManager or JGoodies - include also forms_rt as dependency:
<dependency>
<groupId>com.intellij</groupId>
<artifactId>forms_rt</artifactId>
<version>7.0.3</version>
</dependency>
I had the same problem with building my project with maven. What solved my problem was to change the value for "Generate GUI into:" from "Binary class files" --> "Java source code" in the settings (found in Project|Settings|Editor|GUI Designer).
I've found decision by myself. http://glxn.net/2010/08/17/making-a-swing-project-using-intellij-idea-and-gui-builder-with-maven-including-executable-jar/ You need special plugin to make maven projects with intelliji idea gui designer.
In your dynamic initializer (the part with the {{}}), you are accessing directLineOkButton:
directLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
}
}
});
However, that field hasn't been assigned yet, so you get a NullPointerException.
来源：https://stackoverflow.com/questions/19049253/intellij-idea-gui-designer-maven