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  1. ,

    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

  2. ,

    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via Coderanch by Bernard Sigmund Gustav, 1 year ago
For input string: " 1"
via GitHub by jztech101
, 2 years ago
For input string: "weather"
via Google Groups by hitesh kumar, 6 months ago
via Jenkins JIRA by hiteswar kumar, 1 year ago
java.lang.NumberFormatException: For input string: "
1"	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)	at java.lang.Integer.parseInt(Integer.java:468)	at java.lang.Integer.parseInt(Integer.java:518)	at org.apache.jsp.readtextfile_jsp._jspService(readtextfile_jsp.java:122)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)	at java.lang.Thread.run(Thread.java:534)