title: UTFDataFormatException and ClassNotFoundException when adding an image to Liferay portlet
body: <p>I use Liferay 5.2.3 on Tomcat 5.5. I added the tag</p>
  
  <pre><code>&lt;img alt="G.png" src="&lt;%= request.getContextPath() %&gt;/images/G.png"&gt;
  </code></pre>
  
  <p>to one of the JSPs that I dispatch my portlet to, and I received:</p>
  
  <pre class="lang-none prettyprint-override"><code>ERROR [http-8080-Processor22] (StandardWrapperValve.java:253) Servlet.service() for servlet jsp threw exception
  java.io.UTFDataFormatException: Invalid byte 1 of 1-byte UTF-8 sequence.
          at org.apache.jasper.xmlparser.UTF8Reader.invalidByte(UTF8Reader.java:621)
          at org.apache.jasper.xmlparser.UTF8Reader.read(UTF8Reader.java:492)
          at org.apache.jasper.xmlparser.XMLEncodingDetector.load(XMLEncodingDetector.java:1000)
          at org.apache.jasper.xmlparser.XMLEncodingDetector.skipString(XMLEncodingDetector.java:951)
          at org.apache.jasper.xmlparser.XMLEncodingDetector.scanXMLDecl(XMLEncodingDetector.java:1209)
          at org.apache.jasper.xmlparser.XMLEncodingDetector.getEncoding(XMLEncodingDetector.java:121)
          at org.apache.jasper.xmlparser.XMLEncodingDetector.getEncoding(XMLEncodingDetector.java:109)
          at org.apache.jasper.compiler.ParserController.determineSyntaxAndEncoding(ParserController.java:305)
          at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:170)
          at org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
          at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:156)
          at org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
          at org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
          at org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
          at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
          at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
          at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
          at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
          at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
          at com.liferay.portal.servlet.filters.header.HeaderFilter.processFilter(HeaderFilter.java:109)
          at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:91)
          at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.doFilter(PortalClassLoaderFilter.java:78)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
          at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
          at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
          at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
          at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
          at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
          at java.lang.Thread.run(Thread.java:662)
  
  ERROR [http-8080-Processor20] (StandardWrapperValve.java:253) Servlet.service() for servlet jsp threw exception
  java.lang.ClassNotFoundException: org.apache.jsp.images.G_png
          at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
          at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:131)
          at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
          at org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:597)
          at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:137)
          at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
          at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
          at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
          at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
          at com.liferay.portal.servlet.filters.header.HeaderFilter.processFilter(HeaderFilter.java:109)
          at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:91)
          at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.doFilter(PortalClassLoaderFilter.java:78)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
          at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
          at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
          at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
          at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
          at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
          at java.lang.Thread.run(Thread.java:662)
  </code></pre>
  
  <p>Some images are loaded well and some are not.</p>
  
  <p>What could be going wrong?</p>