异常信息
load font error:{}java.io.IOException: Problem reading font data.at java.awt.Font.createFont0(Font.java:1000)at java.awt.Font.createFont(Font.java:877)at com.anji.captcha.service.impl.ClickWordCaptchaServiceImpl.init(ClickWordCaptchaServiceImpl.java:49)at com.anji.captcha.service.impl.DefaultCaptchaServiceImpl.init(DefaultCaptchaServiceImpl.java:33)at com.anji.captcha.service.impl.CaptchaServiceFactory.getInstance(CaptchaServiceFactory.java:36)at mon.config.CaptchaConfig.captchaService(CaptchaConfig.java:57)at mon.config.CaptchaConfig$$EnhancerBySpringCGLIB$$17f42947.CGLIB$captchaService$0(<generated>)at mon.config.CaptchaConfig$$EnhancerBySpringCGLIB$$17f42947$$FastClassBySpringCGLIB$$8f11612a.invoke(<generated>)
异常原因
由于该项目是从其他服务器上迁移过来的，迁移过程中没有对logs和temp目录进行打包。而 java.awt.Font.createFont0在加载自定义字体时需要创建临时文件，源码如下：
private static Font createFont0(int fontFormat, InputStream fontStream,CreatedFontTracker tracker)throws java.awt.FontFormatException, java.io.IOException {if (fontFormat != Font.TRUETYPE_FONT &&fontFormat != Font.TYPE1_FONT) {throw new IllegalArgumentException ("font format not recognized");}boolean copiedFontData = false;try {//加载字体时在这个位置开始创建临时文件，文件以+~JF开头，.tmp结尾final File tFile = AccessController.doPrivileged(new PrivilegedExceptionAction<File>() {public File run() throws IOException {return Files.createTempFile("+~JF", ".tmp").toFile();}});if (tracker != null) {tracker.add(tFile);}int totalSize = 0;try {final OutputStream outStream =AccessController.doPrivileged(new PrivilegedExceptionAction<OutputStream>() {public OutputStream run() throws IOException {return new FileOutputStream(tFile);}});if (tracker != null) {tracker.set(tFile, outStream);}try {byte[] buf = new byte[8192];for (;;) {int bytesRead = fontStream.read(buf);if (bytesRead < 0) {break;}if (tracker != null) {if (totalSize+bytesRead > CreatedFontTracker.MAX_FILE_SIZE) {throw new IOException("File too big.");}if (totalSize+tracker.getNumBytes() >CreatedFontTracker.MAX_TOTAL_BYTES){throw new IOException("Total files too big.");}totalSize += bytesRead;tracker.addBytes(bytesRead);}outStream.write(buf, 0, bytesRead);}/* don't close the input stream */} finally {outStream.close();}/* After all references to a Font2D are dropped, the file* will be removed. To support long-lived AppContexts,* we need to then decrement the byte count by the size* of the file.* If the data isn't a valid font, the implementation will* delete the tmp file and decrement the byte count* in the tracker object before returning from the* constructor, so we can set 'copiedFontData' to true here* without waiting for the results of that constructor.*/copiedFontData = true;Font font = new Font(tFile, fontFormat, true, tracker);return font;} finally {if (tracker != null) {tracker.remove(tFile);}if (!copiedFontData) {if (tracker != null) {tracker.subBytes(totalSize);}AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {public Void run() {tFile.delete();return null;}});}}} catch (Throwable t) {if (t instanceof FontFormatException) {throw (FontFormatException)t;}if (t instanceof IOException) {throw (IOException)t;}Throwable cause = t.getCause();if (cause instanceof FontFormatException) {throw (FontFormatException)cause;}throw new IOException("Problem reading font data.");}}
开始以为是字体库问题：运行命令
fc-list
和
yum install fontconfig
后并没有解决这个问题。然后不断的翻源码，怀疑是临时文件的问题。查看Tomcat下bin/catalina.sh 文件找到java 的JVM临时目录java.io.tmpdir的配置是CATALINA_TMPDIR=“$CATALINA_BASE”/temp
CATALINA_BASE指向的是Tomcat安装目录，由于是迁移过来的没有对temp目录做打包。在新建temp目录后启动正常
mkdir temp
在此记录一下这问题。
