1 问题

今天启动 Tomcat 后，登录页验证码不见了。在 localhost.xxx.log 发现以下错误：

org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [StickyCaptcha] in context with path [/web2] threw exception [Servlet execution threw an exception] with root cause java.awt.AWTError: Can't connect to X11 window server using 'localhost:11.0' as the value of the DISPLAY variable.	at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)	at sun.awt.X11GraphicsEnvironment.access$200(X11GraphicsEnvironment.java:65)	at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:115)	at java.security.AccessController.doPrivileged(Native Method)	at sun.awt.X11GraphicsEnvironment.
    
     (X11GraphicsEnvironment.java:74)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:264)	at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)	at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1181)	at nl.captcha.text.renderer.DefaultWordRenderer.render(DefaultWordRenderer.java:65)	at nl.captcha.Captcha$Builder.addText(Captcha.java:145)	at com.ncc.core.CustomCaptchaServlet.doGet(Unknown Source)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at com.ncc.services.water.util.XssFilter.doFilter(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)	at com.radiadesign.catalina.session.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:26)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1152)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)复制代码
    

2 分析

因为验证码是通过 AWT 实现的， 而 AWT 会调用操作系统本地窗口资源来绘图， windows 可以很好地支持；但在 linux 下，如果没有进到 X window ， 就无法使用 AWT 绘图。

3 解决

在 tomcat bin 内的 startup.sh，第一行添加：

export CATALINA_OPTS="-Djava.awt.headless=true"复制代码

在操作系统可能缺少显示设备、键盘或鼠标这些外设的情况下可以开启该模式。

好啦，验证码是不是已经出来啦O(∩_∩)O~