Start gdb with the executable and coredump: $ gdb <path to executable> core While in the debugger, use the following commands: (gdb) where ("shows a summary of the stack") ... Example debug session from Debugging Under Unix: gdb Tutorial : Use backtrace (or bt ) to see the callstack: (gdb) backtrace #0 Node<int>::next (this=0x0) ... Inspect the value of item_to_remove at address 0xffbef014 (the value is 1): (gdb) x 0xffbef014 0xffbef014: 0x00000001 (g... Note: The program must be compiled with the debug switch -g in order to see the source code. More resources: Linux software debugging with GDB Debugging with gdb

Syntax highlighted XML schema for JSF 2.0 Application Configuration Resource File ( faces-config.xml ). Almost 3000 lines! <?xml version="1.0" encoding="UTF-8"?> <xsd:sch...

Step 1: Repackage a web app as EAR A Java EE application is a multimodule Maven project. At the very least you'll need to package a WAR and an EAR. To get started, I'll simply re-package the simple webapp as an EAR. Create a directory named javaee-app Copy the webapp from here to javaee-app . Rename struts1app to webapp . Create pom.xml under javaee-app : <project> <modelVersion>4.0.0</modelVersion>... Create a directory named ear under javaee-app . Create pom.xml under ear : <project> <modelVersion>4.0.0</modelVersion>... Modify pom.xml in the webapp directory so that it looks like this: <project> <modelVersion>4.0.0</modelVersion> ... Build with " mvn package " in the javaee-app directory. You can see that ear-1.0.ear is successfully generated in javaee-app/ear/target . Maven successfully resolves dependencies between the sub-projects....

The Android unit test framework is based on JUnit 3 , not JUnit 4. Test cases have to extend junit.framework.TestCase or a subclass (such as android.test.InstrumentationTestCase ). Tests are identified by public methods whose name starts with test , not methods annotated with @Test (as in JUnit 4). An Android test suite is packaged as an APK, just like the application being tested. To create a test package, first you need to identify the application package it is testing. Google suggests to put the test package source in a directory named tests/ alongside the src/ directory of the main application. At runtime, Android instrumentation loads both the test package and the application under test into the same process. Therefore, the tests can invoke methods on...

I just installed Ubuntu 11.04 desktop on my old Dell laptop, but the cdrom is not auto-mounting. Normally this simply works. I tried various things like adding cdrom to /etc/fstab and installing halevt (which failed), none worked. However, I found out that despite talks of using gnome-volume-manager etc, at least for this version of Ubuntu automount is managed by Nautilus (file manager): start gconf-editor and navigate to /apps/nautilus/preferences/ , media_automount should be checked (but it's checked by default, unless you changed it). In the end, I wasn't able to make cdrom automount, although USB drives automounted fine. Instead of wasting more time to diagnose the problem, I manually mounted the cdrom drive: $ sudo mount /dev/cdrom /cdrom

This is a list of built-in Android permission values: Permission Description Since API Level android.permission.ACCESS_CHECKIN_PROPERTIES Allows read/write access to the "properties" table in the checkin database, to change values that get uploaded. 1 android.permission.ACCESS_COARSE_LOCATION Allows an application to access coarse (e.g., Cell-ID, WiFi) location 1 android.permission.ACCESS_FINE_LOCATION Allows an application to access fine (e.g., GPS) location 1 android.permission.ACCESS_LOCATION_EXTRA_COMMANDS Allows an application to access extra location provider commands 1 android.permission.ACCESS_MOCK_LOCATION Allows an application to create mock location providers for testing 1 android.permission.ACCESS_NETWORK_STATE Allows applications to access information about networks 1 android.permission.ACCESS_SURFACE_FLINGER Allows an application to use SurfaceFlinger's low level features 1 android.permission.ACCESS_WIFI_STATE Allows applications to access information about Wi-Fi networks 1 android.permission.ACCOUNT_MANAGER Allows applications to call into AccountAuthenticators. Only the system can get this permission. 5 android.permission.AUTHENTICATE_ACCOUNTS...

This is an example that uses dynamic proxies to trace method calls (in logging) and print out elapsed times for them. Because dynamic proxies can only be generated for interfaces, the service classes must be implemented with interface-implementation pairs. Create services A and B. A.java : public interface A { public void service1()... AImpl.java : import java.util.Random; public class AImpl... B.java : public interface B { public void service1()... BImpl.java : public class BImpl implements B { public vo... The call trace proxy: import java.lang.reflect.*; class TraceProx... The performance proxy: import java.lang.reflect.*; class Performan... The service factory: import java.lang.reflect.*; public class Se... The test class: public class Test { public static void main... The output: Entering AImpl.service1 Entering BImpl.service1... The above example has no information...

dd by default does not give you any indication of progress. You may be wondering what's going on when you are copying a big file and it's taking a long time. You may start dd in the background and send it SIGUSR1 periodically to view progress. However, I think pv is more convenient. $ pv /dev/cdrom | dd of=./cdrom.img bs=64k 1.19... I've seen code like the following in the wild. But it's fragile code at best since it depends on the text output of fdisk. In fact, it doesn't work for most systems since fdisk reports in GB not MB. Plus the regex is unnecessarily complicated. # This does not work! dd if=/dev/hdb | (pv -s `...

The code presented here is a simple implementation of a tab set. It is used to demo how a tab set could be implemented. The code is stand alone and does not depend on any JavaScript libraries. Multiple tab sets within the same page is supported. The HTML markup is fairly simple: Tabs sets are contained within a DIV element with class name "tabsContainer". Define a UL list for the tabs. Follow the UL list with equal number of DIVs for the tab contents. The Nifty Corners Cube technique is used to draw the rounded corners (original form, not the enhanced JavaScript form). HTML, CSS and JavaScript: <!doctype html> <html> <head> <style typ...

These are the steps to create a JBoss 5.1.0 configuration with Tomcat from the built-in minimal configuration. Change directory to $JBOSS_HOME/server . Make a copy of the minimal configuration. cp -R minimal tomcatonly Copy bindingservice.beans from the default configuration. cp -R default/conf/bindingservice.beans tomcatonly... Copy login-config.xml from the default configuration. cp default/conf/login-config.xml tomcatonly/conf/ Edit tomcatonly/conf/jboss-service.xml : Add jars from the common/lib directory: <!-- Load all jars from the JBOSS_DIST/serv... Add the JAAS security manager section (copy from the default profile, and yes, JBoss tomcat can't live without the JBoss JAAS manager). <!-- JAAS security manager and realm mappin... Copy the Tomcat (JBoss web) deployer from the default configuration. cp -R default/deployers/jbossweb.deployer tomcaton... Copy metadata-deployer-jboss-beans.xml and security-deployer-jboss-beans.xml from the default profile. cp default/deployers/metadata-deployer-jboss-b... Copy...