I inherited a Java app that is configured to run in Google App Engine. My pom includes the com.google.appengine.appengine-maven-plugin plugin, which may or may not be related to this question.
In my src directory, in the WEB-INF directory, I have a "app.yaml" file. But when my project is built into a war, the target directory has both a "app.yaml" file and a "appengine-web.xml" file. How did this "appengine-web.xml" file get here?
The first line of this "appengine-web.xml" file says <!-- Generated from app.yaml. Do not edit. -->. If this file was generated from an "app.yaml" file, then what generated it? Which plugin/function has created this file?
As mentioned in the official documentation appengine-web.xml Reference:
App Engine Java applications use a configuration file, named appengine-web.xml, to specify information about your app and to identify which files in the app's WAR file are static files (like images) and which are resource files used by the application.
So, this is created by default, by the App Engine environment, when using the App Engine Maven plugin, so you can handle some specific settings and configurations. You can find more details on these settings here, but it includes the setting of environment variables, how to scale the application - manual, basic or automatic - etc. In addition to that, you can check this example of a sample app that is deployed into war and the file is created as well. Please, bear in mind that this is only on Java 8.
To summarize, this file is created by the App Engine environment when using this plugin, not by a specific function. In this official documentation here, it indicates this as well:
The artifact you used to create the project has done the basic src/main/webapp/WEB-INF/appengine-web.xml configuration for you
So, this confirms that it was created via the plugin. Besides that, it shows the message of the relation with app.yaml, because they work together and each one of them has a specific use and settings that are needed for your application to work correctly.
Let me know if the information helped you!
This was a non-documented feature of App Engine Maven Plugin that was removed about two years ago.
https://github.com/GoogleCloudPlatform/app-maven-plugin/issues/426#issuecomment-665757462
Related
I am trying to install a jar library in the default server in Web Sphere liberty IBM, I already tried putting it in the folder: ..\wlp\lib but the server doesn't recognize it.
I don´t knoe if I need a xml configuration or some thing like this.
any idea that I may be doing wrong?
the library that i wanna put in the server is: com.ibm.ws.webservices.thinclient_8.5.0.jar
The wlp/lib directory is intended for Liberty feature bundles. If you want to install a JAR file that can be loaded by multiple applications, you will need to create a shared library. Instructions for creating shared libraries are available here: https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_classloader.html
It is also possible to install a JAR file that can be loaded without needing to make any configuration changes - this is called the global shared library. To make that work, you would need to copy the JAR file to the wlp/usr/servers//lib/global or wlp/usr/shared/lib/global directories. More info here: https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_classloader_global_libs.html
There are other ways to add JARs to make them available to applications and/or the Liberty runtime called user features and product extensions, but that probably goes beyond what you are looking for. If you want more information on these approaches, you can find them here: https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_feat_develop.html
I have built my jhipster application in production version(frontend app), it did minify all the javascript files and html files, I can see that inside the war, and I run the application in production version too as after completely starting it says jhipster started and the profile has swagger, prod. But when I access my application there is little source folder that gets created and that exposes all of my javascript code as javascript is not minified, over there.
what is this folder?
Why does this folder exists?
how do I disable this folder?
Link to the screenshot
You should probably disable source maps in gulp/build.js also gulp-uglify uses default options which you may want to change.
I have created a dynamic web project. A user library with a jar file is also created.
Then the user library has been added to the build path via
project properties--->java build path--->In libraries tab required user library has added and jar file is specified under it.
But exporting the project into the JBoss deployment directory is raising class not found exception over the class in added jar file.
How can I properly add a user library to my project's build path?
I'm not clearly understand your problem but there is nothing to discuss ;)
Because the Java EE Specifications and the application server are dictating how to place something in your app's classpath and that's it.
Here is the documentation:
https://docs.jboss.org/author/display/AS71/Class+Loading+in+AS7
If your problem is not regarding the result on the appserver, only something about comfor or project strcture you want in your IDE. Then use your build system (Maven) to do the job. Like bilding a jar and coping it to desired location etc.
We currently have an Java application that can be deployed on clients or run as a shortcut from the server. We have intermittently received ClassNotFound exceptions when running the JAR from the server which looks like Windows dropping the network connection with only part of the classes from the JAR loaded (user opens a different screen then the problem is apparent).
I am currently looking at the Web Start technology to allow us to run a single shortcut.
However the application has several folders it requires to be in the same folder the JAR is launched (for configuration, logs, etc.). These folders will require full access for all users to allow them to write log files. There are lots of configuration files under the configuration folder hierarchy.
The application also requires access to environment user settings (such as getting their user folder). It also requires certain command line parameters (including which folder to use for configuration, log file location, java memory usage, etc.)
Edit
The application also contains a reference to 2 signed JARs. These are:
jh.jar
mail.jar
It looks like these are signed by SUN Microsystems. jh is used for help integration in our application whilst mail is used for email integration.
I have now downloaded the latest versions of these files from java2s.com which do not have the signed equivalents.
end edit
The application is developed in Netbeans which compiles a single JAR file and copies the dependant JARs to the dist/lib folder. I enabled the Web Start functionality in Netbeans for the application and it generates the JNLP file.
Bearing everything in mind is Web Start the way to go for an application like this?
Can you include folders in a Web Start deployment? I could not find anything to do this in the XML structure for a JNLP file.
Cheers,
Andez
Yes, you could use WebStart for this.
Permission:
If you need permission to the file system, you have to sign your jars and put the all-permissions tag in your jnlp.
Arguments:
Arguments can be provided by using the arguments elements in application_desc.
Folders:
I'm don't think you can include folders in the WebStart application, but you could put the config files in a jar and read them from there, or extract them on startup.
ClassNotFoundError:
We have intermittently received
ClassNotFound exceptions when running
the JAR from the server which looks
like Windows dropping the network
connection with only part of the
classes from the JAR loaded
Does not sound plausible to me. per default, all jars will be downloaded before the application starts. If you set "download" to "lazy", the jar will be downloaded when first needed, but I would guess it will be downloaded completly then.
You can provide read-only resources for Java WebStart. Getting the log back is harder. I would suggest looking into a centralized logging solution, using one of the standard appenders in the log framework you use.
For a Java Web Start application it is always advised not to create files or folders in the class path. Recommend user's home directory to store your settings or database files.
I'm building an Android application (as an Eclipse project) that needs to access a web service. We will be sending the data from the service as JSON serialized classes, so we want to share some of the classes between the Android application and the server application. We are currently thinking that the way we need to do this is to structure our Git repository with 3 folders. One for the client, one for the server, and one for the shared library.
But at that point we couldn't figure out how to create the shared code. It looks like we can put all the .java files into a folder and then create a relative link to that folder from the other projects, but is that a good way to go about this?
The other possibility we found was to create another project in Eclipse and then include the library project in the client project. However we ran into a problem here. How can we make the library usable by both the server and Android? If I create a new Java project in Eclipse, I must select a JRE to build for, but Dalvik isn't an option, and even if it was how could I use the library with a desktop VM if the library was compiled for Dalvik?
I would use 3 projects:
server
shared
client (android)
and include shared as a project dependency in both server and client. If you use ant you'd drop the shared.jar in both server/lib and client/lib every time it's changed, and if you use maven it's a dependency (possibly with Ant + Ivy it's also a dependency). Consider Nexus as a repository location in that case.
You don't actually need to create a separate Eclipse project for the shared classes. You can just create a 'common source folder' outside of the other two projects' disk hierarchy. For both the server and client projects :in the Properties/Java Build Path/Source add a 'Link source' to the new folder. (Perhaps this is what you meant by 'relative link'). It's easy to add this common source folder to an Ant build file.
You could add the path to the classes/JARs to the server's runtime classpath.
Since it's unclear which one you're using, here's just a generic answer based on Apache Tomcat.
Open /conf/catalina.properties file.
Edit shared.loader entry to include the path to the package root of those classes or JAR file(s).
E.g.
shared.loader = /path/to/classes
or
shared.loader = /path/to/specific.jar
or
shared.loader = /path/to/*.jar
You can even specify multiple paths separated by a comma.