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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.

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java.lang.NumberFormatException: null	at java.lang.Integer.parseInt(Integer.java:415)	at java.lang.Integer.parseInt(Integer.java:497)	at hudson.model.Job$2.compare(Job.java:329)	at hudson.model.Job$2.compare(Job.java:327)	at hudson.widgets.HistoryWidget.doAjax(HistoryWidget.java:118)	at sun.reflect.GeneratedMethodAccessor267.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:103)	at org.kohsuke.stapler.Function.bindAndinvoke(Function.java:57)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:75)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)	at org.kohsuke.stapler.MetaClass$15.dispatch(MetaClass.java:375)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)	at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:254)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:360)	at org.kohsuke.stapler.Stapler.service(Stapler.java:120)	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 hudson.security.HudsonFilter.doFilter(HudsonFilter.java:88)