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&lt;html&gt;&lt;head&gt;&lt;title&gt;apache tomcat/7.0.62 - error report&lt;/title&gt;&lt;style&gt;&lt;!--h1 {font-family:tahoma,arial,sans-serif;color:white;background-color:#525d76;font-size:22px;} h2 {font-family:tahoma,arial,sans-serif;color:white;background-color:#525d76;font-size:16px;} h3 {font-family:tahoma,arial,sans-serif;color:white;background-color:#525d76;font-size:14px;} body {font-family:tahoma,arial,sans-serif;color:bck;background-color:white;} b {font-family:tahoma,arial,sans-serif;color:white;background-color:#525d76;} p {font-family:tahoma,arial,sans-serif;background:white;color:bck;font-size:12px;}a {color : bck;}a.name {color : bck;}hr {color : #525d76;}--&gt;&lt;/style&gt; &lt;/head&gt;&lt;body&gt;&lt;h1&gt;http status 500 - string index out of range: -10&lt;/h1&gt;&lt;hr size=&quot;1&quot; noshade=&quot;noshade&quot;&gt;\r

&lt;b&gt;type&lt;/b&gt; exception report&lt;/p&gt;\r

&lt;b&gt;message&lt;/b&gt; &lt;u&gt;string index out of range: -10&lt;/u&gt;&lt;/p&gt;\r

&lt;b&gt;description&lt;/b&gt; &lt;u&gt;the server encountered an internal error that prevented it from fulfilling this request.&lt;/u&gt;&lt;/p&gt;\r

&lt;b&gt;exception&lt;/b&gt;

java.ng.stringindexoutofboundsexception: string index out of range: -10

java.ng.string.substring(string.java:1911)

.lib.decryptutil.filedecrypt(decryptutil.java:22)

.encrypt.action.execute(action.java:59)

sun.reflect.generatedmethodaessor38.invoke(unknown source)

sun.reflect.delegatingmethodaessorimpl.invoke(delegatingmethodaessorimpl.java:43)

java.ng.reflect.method.invoke(method.java:606)

.opensymphony.xwork2.defaultactioninvocation.invokeaction(defaultactioninvocation.java:452)

.opensymphony.xwork2.defaultactioninvocation.invokeactiononly(defaultactioninvocation.java:291)

.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:254)

.opensymphony.xwork2.interceptor.defaultorkflowinterceptor.dointercept(defaultorkflowinterceptor.java:176)

.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept(methodfilterinterceptor.java:98)