Develop Reference

"Development mode is loading..." and "Waiting for launch URLs" in GWT

I am a beginner in GWT and trying to run a sample HelloWorld program from http://www.vogella.com/tutorials/GWT/article.html. I installed the GWT plugin for Eclipse Kepler 4.3 and downloaded GWT SDK 2.3. While configuring SDK in eclipse, i was getting error that "gwt-codeserver.jar is missing" so i downloaded "gwt-codserver-2.5" jar and copied it to SDK folder and it fixed missing jar issue.
Then i run my application by right-click on the project and selected Run As -> "Web application". Now, i am not getting the url in the Development mode tab instead it shows "Development mode is loading...." and "Waiting for launch URLs" message continuously and nothing happens after that. In console i am getting below message.
Please help to fix this issue.
Unknown Argument: -superDevMode
DevMode [-[no]startServer] [-port port-number | "auto"] [-whitelist whitelist-string] [-blacklist blacklist-string] [-logdir directory] [-logLevel level] [-gen dir] [-bindAddress host-name-or-address] [-codeServerPort port-number | "auto"] [-server servletContainerLauncher[:args]] [-startupUrl url] [-war dir] [-deploy dir] [-extra dir] [-workDir dir] [-sourceLevel [auto, 1.6, 1.7]] module[s]
where
-[no]startServer Starts a servlet container serving the directory specified by the -war flag. (defaults to ON)
-port Specifies the TCP port for the embedded web server (defaults to 8888)
-whitelist Allows the user to browse URLs that match the specified regexes (comma or space separated)
-blacklist Prevents the user browsing URLs that match the specified regexes (comma or space separated)
-logdir Logs to a file in the given directory, as well as graphically
-logLevel The level of logging detail: ERROR, WARN, INFO, TRACE, DEBUG, SPAM, or ALL
-gen Debugging: causes normally-transient generated types to be saved in the specified directory
-bindAddress Specifies the bind address for the code server and web server (defaults to 127.0.0.1)
-codeServerPort Specifies the TCP port for the code server (defaults to 9997)
-server Specify a different embedded web server to run (must implement ServletContainerLauncher)
-startupUrl Automatically launches the specified URL
-war The directory into which deployable output files will be written (defaults to 'war')
-deploy The directory into which deployable but not servable output files will be written (defaults to 'WEB-INF/deploy' under the -war directory/jar, and may be the same as the -extra directory/jar)
-extra The directory into which extra files, not intended for deployment, will be written
-workDir The compiler's working directory for internal use (must be writeable; defaults to a system temp dir)
-sourceLevel Specifies Java source level (defaults to auto:1.7)
and
module[s] Specifies the name(s) of the module(s) to host

Both errors (missing gwt-codeserver, and unknown argument) hint that the Google Plugin for Eclipse didn't properly detect the version of the GWT SDK you're using.
GWT 2.3 is now really old, so I'd suggest trying with GWT 2.7. As you're beginning with GWT, it's also better to start right with SuperDevMode than lose days trying to make DevMode work with recent browsers. Note: that means you'll debug from within the browser, not your IDE (unless you install the SDBG plugin from https://sdbg.github.io)

websphere - CWWKE0054E error unable to open file

i am trying run the websphere liberty profile server from the command line. I am following the steps told here : https://developer.ibm.com/wasdev/downloads/liberty-profile-using-non-eclipse-environments/
I have created the server with the name server1.
But when the extraction completes and I try to start the server using the command : server start server1
the server throws an error : CWWKE0054E: Unable to open file C:\wlp\wlp\usr\servers\server1\logs\C:\Users\Furquan\AppData\Local\Temp\\ihp_custom_batches.log.. Now I know this cant be a valid path, but I dont know where and how to change it. Please help !!

This error is related to the LOG_FILE environment variable that you have defined in your environment by some other program. To solve that, you have the following opions:
Remove LOG_FILE env variable, if it is no longer needed by your system
If you cant do that, override it via server.env file, that you can create in the wlp\usr\servers\serverName directory with the following content:
LOG_FILE=console.log
As last resort (this is not recommended, will make your installation NOT SUPPORTED and in certain installations might get overwritten by updates) - modify the server.bat command line script - in the script find the following section:
if not defined LOG_FILE (
set X_LOG_FILE=console.log
) else (
set X_LOG_FILE=!LOG_FILE!
)
And after the line set X_LOG_FILE=!LOG_FILE! just add another line that will override it with the default like this set X_LOG_FILE=console.log
In general, I'd recommend second solution (with the server.env file), as it is the most portable and will work in any environment.

I have the similar problem for IBM Support Assistant V5. After I deleted %LOG_FILE% from Environment Variables, it worked.

How to disable AspectJ dump files "ajcore.txt"

I've got a Tomcat webapp where I'm using AspectJ for logging and metrics, everything seems fine, but it keep creating several files like ajcore.20150310.113255.780.txt in the root folder. There is no exception in this files, so they are completely useless.
I've found this: https://eclipse.org/aspectj/doc/released/pdguide/ajcore.html
That states that using org.aspectj.weaver.Dump.exception="false" should disable this behavior, yet the files are still appearing. Is there any other way to completely disable the creation of this files? The other option mentioned: org.aspectj.dump.directory would also solve the problem, but it doesn't seem to work either.
This is the content of the file in case it helps for anything:
---- AspectJ Properties ---
AspectJ Compiler 1.7.1 built on Thursday Sep 6, 2012 at 16:39:22 GMT
---- Dump Properties ---
Dump file: ajcore.20150310.113255.780.txt
Dump reason: org.aspectj.weaver.BCException
Dump on exception: true
Dump at exit condition: abort
---- Exception Information ---
---- System Properties ---
... My system properties here
---- Command Line --- Empty
---- Full Classpath --- Empty
---- Compiler Messages --- Empty

Either of the following options may help:
Executing this code before any AspectJ weaving occurs (if possible): org.aspectj.weaver.Dump.setDumpOnExit(org.aspectj.bridge.IMessage.ABORT)
Adding this system property definition to your java command-line: -Dorg.aspectj.weaver.Dump.condition=abort

I think it is good that the AJ core dump happens because something seems to go wrong during LTW compilation:
Dump file: ajcore.20150310.113255.780.txt
Dump reason: org.aspectj.weaver.BCException
So there is an exception and you should investigate and fix it. Maybe some of your classes are woven with the logging code correctly and some are not. Run the weaver in verbose mode and check your console output, maybe you see something strange there. An AJ core file means that the weaver/compiler was shut down completely (abnormal termination).
As for the actual problem, I think that this
---- Command Line --- Empty
looks strange, as if no command line parameters were passed to the weaver. Also that no exception is actually logged is really unusual.
Which Java version are you on? I assume Java 7 because 1.6 is really old and Java 8 needs AspectJ 1.8. Anyway, can you try to use the latest AspectJ version 1.8.5 or at least the latest 1.7.4 from the old release and see if the problem still occurs?

Add this argument to your JVM run: -Dorg.aspectj.weaver.Dump.exception=false
And also see official docs

Bug in debugging Red5 server as Java Application inside eclipse

I am following
Red5 Media Server - Workspace Setup Guide - r4737!
I am able to build Red5 distribution and rename distribution jar files i.e completed upto step 6.But when I followed step 7 - Run inside of eclipse failed to debug it as java application -
Red5 root: /home/yuvraj/Documents/RED5/red5 java code all/java/server/trunk
Configuation root: /home/yuvraj/Documents/RED5/red5 java code all/java/server/trunk/conf
Red5 server jar was not found, using fallback.
URL list: [file:/home/yuvraj/Documents/RED5/red5%20java%20code%20all/java/server/trunk/red5.jar]
Bootstrap exception: null
Bootstrap exit
java.lang.NullPointerException
at org.red5.classloading.ClassLoaderBuilder.build(ClassLoaderBuilder.java:172)
at org.red5.classloading.ClassLoaderBuilder.build(ClassLoaderBuilder.java:96)
at org.red5.server.Bootstrap.bootStrap(Bootstrap.java:117)
at org.red5.server.Bootstrap.main(Bootstrap.java:48)
I couldn't find conf directory neither in /home/yuvraj/Documents/RED5/red5 java code all/java/server/trunk/ nor in /Red5_server/bin while setting classpath in java debug.

If you followed step by step the guide, you are probably using the 1.0.2 RC4.
Try this now:
Extract the red5-server-1.0.2-RC4.zip from the target folder to a custom folder
(I have it in c:\red5-server-1.0.2-RC4 )
Copy red5.jar and bootstrap.jar in the place you extracted red5. (In my case c:\red5-server-1.0.2-RC4\ )
Repeat the step 7 in the Guide and be carefull at point L.
conf directory is in \red5-server-1.0.2-RC4\

From the output you've shown, I'd assume you're missing the lib directory and its contents. This wiki link should help: https://code.google.com/p/red5/wiki/ServerWontStart#Bootstrap_exception

Setting the location of debug.keystore for command-line build without rewriting Ant targets

When I run "ant debug" from the command line, I get the following error message:
[apkbuilder] keytool error: java.io.FileNotFoundException: \stulab2\folderRedir
ection$.android\debug.keystore (The system cannot find the path specified)
BUILD FAILED
e:\programs\java\android-sdk\tools\ant\build.xml:919: The following error occurred while executing this line:
e:\programs\java\android-sdk\tools\ant\build.xml:930: The following error occurred while executing this line:
e:\programs\java\android-sdk\tools\ant\build.xml:295: com.android.sdklib.build.ApkCreationException: Unable to get debug signature key
at com.android.sdklib.build.ApkBuilder.getDebugKey(ApkBuilder.java:277)
A very long stack trace follows.
The problem is that I am on a public computer and do not have write access to the folder where Ant expects to find .android\debug.keystore. Some research found the following in the Android documentation:
If necessary, you can change the location/name of the debug keystore/key or supply a custom debug keystore/key to use. However, any custom debug keystore/key must use the same keystore/key names and passwords as the default debug key (as described above). (To do so in Eclipse/ADT, go to Windows > Preferences > Android > Build.)
Unfortunately, this doesn't explain how to change the locationof the debug keystore using the command-line tools.
Several months ago, someone asked basically the same question here on stackoverflow: How can I specify location of debug keystore for Android ant debug builds?. The best answer so far is to rewrite the -do-debug target. From what I can tell, I would also need to set the properties specified.
One problem with this answer is that it uses the same properites as the release build does. Also, it would be nice to simply set the correct properties rather than rewriting (and debugging) the whole -do-debug target. Does anyone know if there are properties that can be set to specify the location of the debug.keystore file?

In .bashrc, set the ANDROID_SDK_HOME environment variable to the location of your Android SDK installation. For example:
export ANDROID_SDK_HOME="/home/myusername/path/to/androidsdk"
Then, in a new shell, running ant debug creates a ${ANDROID_SDK_HOME}/.android/debug.keystore file.
Alternatively, without changing the variable globally, you can simply run:
ANDROID_SDK_HOME="/home/myusername/path/to/androidsdk" ant debug