How to fix a NullPointerException error when running a program with becker.jar as an external jar?
I am setting up a program for a class I am taking. All the code has been provided and I have configured everything into Eclipse. I also had to use becker.jar as an external jar file in the Libraries -> Classpath. When I run the program an error occurs about a NullPointerException.
I already tried changing the becker.jar into the modulepath instead of classpath but then Eclipse cannot find the file. I also tried reinstalling becker.jar as well as redoing the entire setup for the project.
Here is the code I am trying to set up:
import becker.robots.*;
/*
Starting Template:
This file was created in order to provide you with a pre made
'starter' program
*/
public class Starting_Template extends Object {
public static void main(String args) {
City toronto = new City();
Robot jo = new Robot(toronto, 3, 0, Direction.EAST, 0);
new Thing(toronto, 3, 2);
jo.move();
jo.turnLeft();
}
}
When running this error shows up:
Exception in thread "main" java.lang.NullPointerException
at java.desktop/sun.font.FontDesignMetrics.getDefaultFrc(FontDesignMetrics.java:158)
at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:279)
at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1183)
at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
at java.desktop/javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(BasicLabelUI.java:245)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
at java.desktop/javax.swing.JSlider.updateLabelUIs(JSlider.java:853)
at java.desktop/javax.swing.JSlider.setLabelTable(JSlider.java:824)
at becker.robots.x.<init>(SourceFile:32)
at becker.robots.RobotUIComponents.<init>(SourceFile:87)
at becker.robots.RobotUIComponents.<init>(SourceFile:110)
at becker.robots.City.a(SourceFile:228)
at becker.robots.City.<init>(SourceFile:97)
at becker.robots.City.<init>(SourceFile:47)
at Starting_Template.main(Starting_Template.java:10)
java eclipse nullpointerexception karel
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
add a comment |
I am setting up a program for a class I am taking. All the code has been provided and I have configured everything into Eclipse. I also had to use becker.jar as an external jar file in the Libraries -> Classpath. When I run the program an error occurs about a NullPointerException.
I already tried changing the becker.jar into the modulepath instead of classpath but then Eclipse cannot find the file. I also tried reinstalling becker.jar as well as redoing the entire setup for the project.
Here is the code I am trying to set up:
import becker.robots.*;
/*
Starting Template:
This file was created in order to provide you with a pre made
'starter' program
*/
public class Starting_Template extends Object {
public static void main(String args) {
City toronto = new City();
Robot jo = new Robot(toronto, 3, 0, Direction.EAST, 0);
new Thing(toronto, 3, 2);
jo.move();
jo.turnLeft();
}
}
When running this error shows up:
Exception in thread "main" java.lang.NullPointerException
at java.desktop/sun.font.FontDesignMetrics.getDefaultFrc(FontDesignMetrics.java:158)
at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:279)
at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1183)
at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
at java.desktop/javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(BasicLabelUI.java:245)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
at java.desktop/javax.swing.JSlider.updateLabelUIs(JSlider.java:853)
at java.desktop/javax.swing.JSlider.setLabelTable(JSlider.java:824)
at becker.robots.x.<init>(SourceFile:32)
at becker.robots.RobotUIComponents.<init>(SourceFile:87)
at becker.robots.RobotUIComponents.<init>(SourceFile:110)
at becker.robots.City.a(SourceFile:228)
at becker.robots.City.<init>(SourceFile:97)
at becker.robots.City.<init>(SourceFile:47)
at Starting_Template.main(Starting_Template.java:10)
java eclipse nullpointerexception karel
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
Oracle Corporation may own Java but please do not use the[oracle]tag unless your question relates to a problem connecting your Java program to an Oracle database.
– APC
Dec 31 '18 at 8:19
add a comment |
I am setting up a program for a class I am taking. All the code has been provided and I have configured everything into Eclipse. I also had to use becker.jar as an external jar file in the Libraries -> Classpath. When I run the program an error occurs about a NullPointerException.
I already tried changing the becker.jar into the modulepath instead of classpath but then Eclipse cannot find the file. I also tried reinstalling becker.jar as well as redoing the entire setup for the project.
Here is the code I am trying to set up:
import becker.robots.*;
/*
Starting Template:
This file was created in order to provide you with a pre made
'starter' program
*/
public class Starting_Template extends Object {
public static void main(String args) {
City toronto = new City();
Robot jo = new Robot(toronto, 3, 0, Direction.EAST, 0);
new Thing(toronto, 3, 2);
jo.move();
jo.turnLeft();
}
}
When running this error shows up:
Exception in thread "main" java.lang.NullPointerException
at java.desktop/sun.font.FontDesignMetrics.getDefaultFrc(FontDesignMetrics.java:158)
at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:279)
at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1183)
at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
at java.desktop/javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(BasicLabelUI.java:245)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
at java.desktop/javax.swing.JSlider.updateLabelUIs(JSlider.java:853)
at java.desktop/javax.swing.JSlider.setLabelTable(JSlider.java:824)
at becker.robots.x.<init>(SourceFile:32)
at becker.robots.RobotUIComponents.<init>(SourceFile:87)
at becker.robots.RobotUIComponents.<init>(SourceFile:110)
at becker.robots.City.a(SourceFile:228)
at becker.robots.City.<init>(SourceFile:97)
at becker.robots.City.<init>(SourceFile:47)
at Starting_Template.main(Starting_Template.java:10)
java eclipse nullpointerexception karel
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
I am setting up a program for a class I am taking. All the code has been provided and I have configured everything into Eclipse. I also had to use becker.jar as an external jar file in the Libraries -> Classpath. When I run the program an error occurs about a NullPointerException.
I already tried changing the becker.jar into the modulepath instead of classpath but then Eclipse cannot find the file. I also tried reinstalling becker.jar as well as redoing the entire setup for the project.
Here is the code I am trying to set up:
import becker.robots.*;
/*
Starting Template:
This file was created in order to provide you with a pre made
'starter' program
*/
public class Starting_Template extends Object {
public static void main(String args) {
City toronto = new City();
Robot jo = new Robot(toronto, 3, 0, Direction.EAST, 0);
new Thing(toronto, 3, 2);
jo.move();
jo.turnLeft();
}
}
When running this error shows up:
Exception in thread "main" java.lang.NullPointerException
at java.desktop/sun.font.FontDesignMetrics.getDefaultFrc(FontDesignMetrics.java:158)
at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:279)
at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1183)
at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
at java.desktop/javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(BasicLabelUI.java:245)
at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
at java.desktop/javax.swing.JSlider.updateLabelUIs(JSlider.java:853)
at java.desktop/javax.swing.JSlider.setLabelTable(JSlider.java:824)
at becker.robots.x.<init>(SourceFile:32)
at becker.robots.RobotUIComponents.<init>(SourceFile:87)
at becker.robots.RobotUIComponents.<init>(SourceFile:110)
at becker.robots.City.a(SourceFile:228)
at becker.robots.City.<init>(SourceFile:97)
at becker.robots.City.<init>(SourceFile:47)
at Starting_Template.main(Starting_Template.java:10)
java eclipse nullpointerexception karel
java eclipse nullpointerexception karel
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
edited Dec 31 '18 at 10:16
Wojciech Wirzbicki
1,1031224
1,1031224
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
asked Dec 31 '18 at 2:17
CosmoCrashCosmoCrash
194
194
Oracle Corporation may own Java but please do not use the[oracle]tag unless your question relates to a problem connecting your Java program to an Oracle database.
– APC
Dec 31 '18 at 8:19
add a comment |
Oracle Corporation may own Java but please do not use the[oracle]tag unless your question relates to a problem connecting your Java program to an Oracle database.
– APC
Dec 31 '18 at 8:19
Oracle Corporation may own Java but please do not use the
[oracle] tag unless your question relates to a problem connecting your Java program to an Oracle database.– APC
Dec 31 '18 at 8:19
Oracle Corporation may own Java but please do not use the
[oracle] tag unless your question relates to a problem connecting your Java program to an Oracle database.– APC
Dec 31 '18 at 8:19
add a comment |
1 Answer
1
active
oldest
votes
This is a bug. See for example https://issues.jboss.org/browse/PLANNER-255?_sscc=t - the becker.jar has nothing to do with it.
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53982994%2fhow-to-fix-a-nullpointerexception-error-when-running-a-program-with-becker-jar-a%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is a bug. See for example https://issues.jboss.org/browse/PLANNER-255?_sscc=t - the becker.jar has nothing to do with it.
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
add a comment |
This is a bug. See for example https://issues.jboss.org/browse/PLANNER-255?_sscc=t - the becker.jar has nothing to do with it.
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
add a comment |
This is a bug. See for example https://issues.jboss.org/browse/PLANNER-255?_sscc=t - the becker.jar has nothing to do with it.
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
This is a bug. See for example https://issues.jboss.org/browse/PLANNER-255?_sscc=t - the becker.jar has nothing to do with it.
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
answered Dec 31 '18 at 2:21
rzwitserlootrzwitserloot
3,45911013
3,45911013
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53982994%2fhow-to-fix-a-nullpointerexception-error-when-running-a-program-with-becker-jar-a%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Oracle Corporation may own Java but please do not use the
[oracle]tag unless your question relates to a problem connecting your Java program to an Oracle database.– APC
Dec 31 '18 at 8:19