Question

i get this error when i calculate the string value : Double.toString(Double.parseDouble(suggestionSortScore) – 6)

17:47:19,983 INFO [STDOUT] [EDS ALL LIST] NOC BLACK LIST : Sugeng
Hindarjo

17:47:19,984 ERROR [[jsp]] Servlet.service() for servlet jsp threw
exception java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:994)
at java.lang.Double.parseDouble(Double.java:510)
at org.apache.jsp.WEB_002dINF.jsp.n51Alist_jsp.getTransactionsFromIpg(n51Alist_jsp.java:380)
at org.apache.jsp.WEB_002dINF.jsp.n51Alist_jsp._jspService(n51Alist_jsp.java:581)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at nsia.owasp.util.Controller.doPost(Controller.java:166)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437)
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:366)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:662) 17:47:19,984 INFO [STDOUT] Exception => org.apache.jasper.JasperException: An exception
occurred processing JSP page /WEB-INF/jsp/n51Alist.jsp at line 370

367: if(cekBlackListByNoc==true){

368: System.out.println(“[EDS ALL LIST] NOC BLACK
LIST : ” + nameOnCardDecrypt);

369: data[0] = “yellow”;

370: data[17] =
Double.toString(Double.parseDouble(suggestionSortScore) – 6);

371: if (Double.parseDouble(data[17]) < 3.0) {

372: data[17] = “3.1”;

373: }

why the stacktrace said emptystring? the suggestionsortscore is filled with value “5.0”.

Answer 1

Double.toString(Double.parseDouble(suggestionSortScore) - 6) — will through an exception only when string suggestionSortScore does not contain a parsable double