B4J Question Java 8, 11 are both not compiling on my computer.

[Beja]

Hi all,
Today I did clean installations of B4J and Java.. first I installed Java 8, then Java 11.. they gave two different errors.
please see the following error descriptions .. Any help with meaning appreciated..
Best, -B

Compiling generated Java code. with Java 11 Error
B4J line: 53
icon1.Initialize(\
src\b4j\example\main.java:122: error: package javafx.scene.image does not exist
_icon1.Initialize(ba,"icon1",(javafx.scene.image.Image)(_img.getObject()),anywheresoftware.b4a.keywords.Common.ArrayToList(_menuitems));

--------------------------------------------------------------
javac 1.8.0_191
src\b4j\example\astart.java:37: error: cannot access JServlet
public String _handle(anywheresoftware.b4j.object.JServlet.ServletRequestWrapper _req,anywheresoftware.b4j.object.JServlet.ServletResponseWrapper _resp) throws Exception{
^
bad class file: C:\B4J\B4J\libraries\jserver.jar(anywheresoftware/b4j/object/JServlet.class)
class file has wrong version 55.0, should be 52.0
Please remove or make sure it appears in the correct subdirectory of the classpath.

 

[Beja]

Edit:
This is the log file

java.lang.NoClassDefFoundError: javafx/scene/image/Image
at anywheresoftware.b4j.objects.ImageViewWrapper$ImageWrapper.Initialize2(ImageViewWrapper.java:146)
at anywheresoftware.b4j.objects.ImageViewWrapper$ImageWrapper.Initialize(ImageViewWrapper.java:139)
at b4j.example.main._appstart(main.java:118)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:111)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:98)
at b4j.example.main.main(main.java:28)
Caused by: java.lang.ClassNotFoundException: javafx.scene.image.Image
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 10 more
main._appstart (java line: 118)
java.lang.NoClassDefFoundError: javafx/scene/image/Image
at anywheresoftware.b4j.objects.ImageViewWrapper$ImageWrapper.Initialize2(ImageViewWrapper.java:146)
at anywheresoftware.b4j.objects.ImageViewWrapper$ImageWrapper.Initialize(ImageViewWrapper.java:139)
at b4j.example.main._appstart(main.java:118)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:111)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:98)
at b4j.example.main.main(main.java:28)
Caused by: java.lang.ClassNotFoundException: javafx.scene.image.Image
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 10 more

 

[teddybear]

Where did you get the jdk11? Is it from https://b4xfiles-4c17.kxcdn.com/jdk-11.0.1.zip?
it seems that you are compiling with java8 using java11 library
If you are compiling jserver app with java 8 , then you should use jServer3 instead of jServer4

 

[Beja]

Where did you get the jdk11? Is it from https://b4xfiles-4c17.kxcdn.com/jdk-11.0.1.zip?

Yes.. from b4xfiles

 

[aeric]

Are you compiling a non-ui app (such as B4J server) which uses UI elements inside a class (such as image)?

 

[teddybear]

Compiling generated Java code. with Java 11 Error
B4J line: 53
icon1.Initialize(\
src\b4j\example\main.java:122: error: package javafx.scene.image does not exist
_icon1.Initialize(ba,"icon1",(javafx.scene.image.Image)(_img.getObject()),anywheresoftware.b4a.keywords.Common.ArrayToList(_menuitems));

I suspect it is an incomplete for installing java11. you can check if the javafx.graphics.jar is existed in javafx/lib.

javac 1.8.0_191
src\b4j\example\astart.java:37: error: cannot access JServlet
public String _handle(anywheresoftware.b4j.object.JServlet.ServletRequestWrapper _req,anywheresoftware.b4j.object.JServlet.ServletResponseWrapper _resp) throws Exception{
^
bad class file: C:\B4J\B4J\libraries\jserver.jar(anywheresoftware/b4j/object/JServlet.class)
class file has wrong version 55.0, should be 52.0
Please remove or make sure it appears in the correct subdirectory of the classpath.

Try using jServer3 library to compile it with java8 if it is possible

 

[Beja]

Are you compiling a non-ui app (such as B4J server) which uses UI elements inside a class (such as image)?

\Precisely

 

[Beja]

Try using jServer3 library to compile it with java8 if it is possible

Thanks but that didn't work

 

[teddybear]

Thanks but that didn't work

What's the log?

 

[aeric]

\Precisely

What are you trying to do?
As I know, it is impossible to use Image object in a non-ui app. You may need to create another ui app and call it from the non-ui server app or use other approach which doesn't make use of Image.

 

[Beja]

What are you trying to do?
As I know, it is impossible to use Image object in a non-ui app. You may need to create another ui app and call it from the non-ui server app or use other approach which doesn't make use of Image.

It's the icon that appears at the taskbar, indicating the server is running.. It was working before.
Like this: