libawt_xawt.so
java應用添加了對圖片水印和縮略圖處理後,部署在ubuntu服務器,報錯:
java.lang.UnsatisfiedLinkError: /mnt/jdk1.8/jre/lib/amd64/libawt_xawt.so: libXrender.so.1: cannot open shared object file: No such file or directory
java.lang.UnsatisfiedLinkError: /mnt/jdk1.8/jre/lib/amd64/libawt_xawt.so: libXtst.so.6: cannot open shared object file: No such file or directory
安裝插件:
apt-get install libxrender-dev
apt-get install libxtst-dev
X11GraphicsEnvironment
重啓tomcat後繼續報錯:
Caused by: java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
Caused by: java.lang.InternalError: Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable.
原因是在Linux下,用java圖片jar包處理圖片時,需要本地的x-server的支持,java 1.4版本以上啓動時加上參數:
-Djava.awt.headless=true
對於tomcat,在catalina.sh或catalina.bat中,所有類似以下代碼:
"$_RUNJAVA" $JAVA_OPTS $CATALINA_OPTS \
-Djava.endorsed.dirs="$JAVA_ENDORSED_DIRS" -classpath "$CLASSPATH" \
-Djava.security.manager \
-Djava.security.policy=="$CATALINA_BASE"/conf/catalina.policy \
-Dcatalina.base="$CATALINA_BASE" \
-Dcatalina.home="$CATALINA_HOME" \
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
在尾部添加:
-Djava.awt.headless=true \
修改後內容如下:
...
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
-Djava.awt.headless=true \
...
附:Headless mode
Headless模式是系統的一種配置模式。在該模式下,系統缺少了顯示設備、鍵盤或鼠標,一般Linux服務端使用headless mode。
java查看headless mode:
System.setProperty("java.awt.headless","true")