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  1. ,

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

  2. ,

    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.

Solutions on the web

via Google Groups by samantang via StackOverflow, 6 months ago
via Google Groups by Danilo Pereira De Luca via StackOverflow, 8 months ago
via GitHub by briandealwis
, 9 months ago
Unable to create a DevAppServer
via Google Groups by samantang via StackOverflow, 6 months ago
via GitHub by tarun14110
, 1 year ago
java.lang.NumberFormatException: For input string: "${app.maxinstances}"	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)	at java.lang.Integer.parseInt(Integer.java:481)	at java.lang.Integer.parseInt(Integer.java:527)	at com.google.appengine.tools.development.BasicModule.toInstanceHolders(BasicModule.java:36)	at com.google.appengine.tools.development.BasicModule.(BasicModule.java:30)	at com.google.appengine.tools.development.Modules.createModules(Modules.java:57)	at com.google.appengine.tools.development.DevAppServerImpl.(DevAppServerImpl.java:155)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at com.google.appengine.tools.development.DevAppServerFactory.doCreateDevAppServer(DevAppServerFactory.java:274)	at com.google.appengine.tools.development.DevAppServerFactory.access$000(DevAppServerFactory.java:36)	at com.google.appengine.tools.development.DevAppServerFactory$1.run(DevAppServerFactory.java:236)	at com.google.appengine.tools.development.DevAppServerFactory$1.run(DevAppServerFactory.java:234)	at java.security.AccessController.doPrivileged(Native Method)	at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:234)	at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:104)	at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:265)	at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)	at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:225)	at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:216)