出现java.lang.NoClassDefFoundError: sun/awt/X11GraphicsEnvironment异常
内容为站提复制，解决问题立竿见影
问题描述：
项目在window中使用POI导出Excel没有任何问题，而到linux中使用POI导出Excel出现：java.lang.NoClassDefFoundError: sun/awt/X11GraphicsEnvironment异常信息
异常信息如下：
Caused by: java.lang.NoClassDefFoundError: sun/awt/X11GraphicsEnvironment
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
at sun.font.FontManager.initSGEnv(FontManager.java:1094)
at sun.font.FontManager.findFont2D(FontManager.java:1756)
at java.awt.Font.getFont2D(Font.java:452)
at java.awt.Font.canDisplay(Font.java:1835)
at java.awt.Font.canDisplayUpTo(Font.java:1901)
at java.awt.font.TextLayout.singleFont(TextLayout.java:451)
at java.awt.font.TextLayout.(TextLayout.java:509)
at com.ai.mapp.service.table.utils.ReportExportExcel.exportExcel(ReportExportExcel.java:70)
at com.ai.mapp.action.business.ReportDataAction.expReportExcel(ReportDataAction.java:362)
... 56 more
解决方案：
在tomcat配置文件catalina.sh文件中添加 CATALINA_OPTS="-Djava.awt.headless=true"
catalina.sh添加之后如下：
# LOGGING_CONFIG (Optional) Override Tomcat's logging config file
# Example (all one line)
# LOGGING_CONFIG="-Djava.util.logging.config.file=$CATALINA_BASE/conf/logging.properties"
#
# LOGGING_MANAGER (Optional) Override Tomcat's logging manager
# Example (all one line)
# LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
#
# $Id: catalina.sh 1146097 2011-07-13 15:25:05Z markt $
# -----------------------------------------------------------------------------
JAVA_OPTS="-Xms512m -Xmx19500m"
CATALINA_OPTS="-Djava.awt.headless=true"
# OS specific support. $var _must_ be set to either true or false.
cygwin=false
os400=false
darwin=false
case "`uname`" in
CYGWIN*) cygwin=true;;
OS400*) os400=true;;
Darwin*) darwin=true;;
esac
# resolve links - $0 may be a softlink
PRG="$0"
while [ -h "$PRG" ]; do
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