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You can contribute to the development of Piggydb by creating a new ticket with the following error details (Piggydb Issue Tracking System).

Exception
Classognl.OgnlException
Messageid
ognl.OgnlException: id [java.lang.NumberFormatException: For input string: "null"]
	at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:83)
	at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:131)
	at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:1670)
	at ognl.ASTProperty.setValueBody(ASTProperty.java:101)
	at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
	at ognl.SimpleNode.setValue(SimpleNode.java:246)
	at ognl.Ognl.setValue(Ognl.java:476)
	at net.sf.click.util.PropertyUtils.setValueOgnl(PropertyUtils.java:169)
	at net.sf.click.ClickServlet.processPageRequestParams(ClickServlet.java:1111)
	at net.sf.click.ClickServlet.initPage(ClickServlet.java:1056)
	at net.sf.click.ClickServlet.createPage(ClickServlet.java:877)
	at net.sf.click.ClickServlet.handleRequest(ClickServlet.java:345)
	at net.sf.click.ClickServlet.doGet(ClickServlet.java:284)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at marubinotto.util.web.CustomizedSecurityFilter.doFilter(CustomizedSecurityFilter.java:29)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	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)
/-- Encapsulated exception ------------\
java.lang.NumberFormatException: For input string: "null"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Long.parseLong(Long.java:589)
	at java.lang.Long.parseLong(Long.java:631)
	at ognl.OgnlOps.longValue(OgnlOps.java:191)
	at net.sf.click.util.RequestTypeConverter.convertValue(RequestTypeConverter.java:112)
	at net.sf.click.util.RequestTypeConverter.convertValue(RequestTypeConverter.java:63)
	at ognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:701)
	at ognl.OgnlRuntime.setFieldValue(OgnlRuntime.java:1153)
	at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:76)
	at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:131)
	at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:1670)
	at ognl.ASTProperty.setValueBody(ASTProperty.java:101)
	at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
	at ognl.SimpleNode.setValue(SimpleNode.java:246)
	at ognl.Ognl.setValue(Ognl.java:476)
	at net.sf.click.util.PropertyUtils.setValueOgnl(PropertyUtils.java:169)
	at net.sf.click.ClickServlet.processPageRequestParams(ClickServlet.java:1111)
	at net.sf.click.ClickServlet.initPage(ClickServlet.java:1056)
	at net.sf.click.ClickServlet.createPage(ClickServlet.java:877)
	at net.sf.click.ClickServlet.handleRequest(ClickServlet.java:345)
	at net.sf.click.ClickServlet.doGet(ClickServlet.java:284)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at marubinotto.util.web.CustomizedSecurityFilter.doFilter(CustomizedSecurityFilter.java:29)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	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)
\--------------------------------------/

Page
Classnamemarubinotto.piggydb.ui.page.FragmentPage
Path/fragment.htm

Request
Attributes 
Auth Typenull
Context Path
Headersaccept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
accept-encoding=x-gzip, gzip, deflate
host=piggydb.jp
user-agent=CCBot/2.0 (http://commoncrawl.org/faq/)
Queryid=null
MethodGET
Parametersid=null
Remote Usernull
URI/fragment.htm
URLhttp://piggydb.jp/fragment.htm
Session