Shulou(Shulou.com)06/03 Report--

The JFreechart part runs well under the local windows+tomcat, but after the unix+tomcat is put on the server, the chart and picture cannot be displayed normally, the picture shows a red fork, and the text on the picture cannot be displayed.

After searching for many related questions on the Internet, we finally found the root cause of the problem:

When java implements the drawing function on the * unix platform, it relies on the operating system XServer for drawing. Cannot be called when started from the terminal interface.

The detailed explanation and solution are as follows:

Http://qjmouse.javaeye.com/blog/296092

The system uses jfreechart to draw pictures, and there are problems in some * unix systems. The solutions are as follows. Other similar problems can also be solved by reference.

1. The graph cannot be displayed. The exception is: Can't connect to X11 window server using': 0.0' as

The value of the DISPLAY variable.

Reason: when java implements the drawing function on the * unix platform, it relies on the operating system XServer for drawing. Cannot be called when started from the terminal interface.

Solution: use java's headles mode without invoking operating system local resources.

Configuration: go to was console > Server > Application Server > servername > process definition >

Java virtual machine, setting the generic JVM argument to

"- Djava.awt.headless=true", restart WAS.

two。 You can draw, but it appears as a square in Chinese.

Reason: jdk uses the English font.properties description file by default

Solution: replace the font description file with the Chinese version and enter the lib directory where WAS uses JRE, such as / opt/IBM/WebSphere/AppServer/java/jre

/ lib, back up the original font.properties, rename font.properties.zh to font.properties, and restart WAS.

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