Someone with a b4j solution on a productive hosted server?

[KMatle]

Inhouse solutions (intranet) are quite simple to develop. But what about the "real" world? Anyone here with a hosted server using b4j as the main server component? Hod did you do it?

 

[Erel]

B4i remote compilers are implemented with B4J (as well as two other B4J server programs that manage the builders).

 

[lemonisdead]

@KMatle: this is a really good question. In fact, because of my lack of knowledge, I was not able to install a way to start the java files produced by B4J. In fact, I could have been able to install the packages on my Linux VPS with CLI but I wouldn't have been able to execute the apps...
But this thread gave me the idea to test the solution again

Spoiler: Error

s1:~/www/b4j$ java -jar WebAppHelloWorld.jar
main._process_globals (java line: 69)
java.lang.UnsupportedClassVersionError: anywheresoftware/b4j/object/ServerWrapper : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
at b4j.example.main._process_globals(main.java:69)
at b4j.example.main.initializeProcessGlobals(main.java:60)
at b4j.example.main.main(main.java:27)

 

[Erel]

On Linux the simplest way to run a B4J server is with a script that calls:
nohup java -jar <jar file>

The error message means that you need to switch to a more recent version of Java JRE.

Run java -version to test the version. It should be java 7+.

 

[lemonisdead]

@Erel : I due you a lot of thanks because without your help I wouldn't have found that the OpenJDK was used instead of the Oracle one (I had installed Java via apt-get without the proprietary repositories). Now, with the help of that page, I was able to correct my installation.
And guess what : the Web App Hello World is running
Many, many thanks for that help because it opens a lot of possibilities

 

[KMatle]

Nice, @lemonisdead

 

[lemonisdead]

I can understand my reply was not exciting at all. Today I have updated a Customer's app including a sync function to a B4J server to save the apps preferences. 50 users were updated. The solution is running smoothly

 

[Erel]

See these two processes. ServerExample.jar process (which is a complex app with many examples, web socket handlers and regular servlets) is running for 4 months now. The memory usage is constant.
The second process is running for more than two months.

 

[KMatle]

Cool. @lemonisdead : What kind of server is it (hosted? shared?)

 

[Erel]

VPS. You cannot run B4J servers on shared accounts.

 

[lemonisdead]

@KMatle : I have installed this first server on a VPS as a test drive. I will publish other projects on a dedicated one (which was not already configured to use the correct Java version at the time I had published).

@Erel : I do really thank you for the quality of your amazing products. Really

 

[Erel]

Note that you don't really need to install Java. You can copy the files to a folder and then instead of writing java -jar you should write <full path to java>/bin/java -jar.