Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Samebug tips

  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 roller-user by raghs, 1 year ago
via roller-user by David Bloom, 1 year ago
via roller-user by raghs, 1 year ago
via roller-user by David Bloom, 1 year ago
via Coderanch by Jaikiran Pai, 1 year ago
java.lang.NumberFormatException: null	at java.lang.Integer.parseInt(Integer.java:415)	at java.lang.Integer.parseInt(Integer.java:497)	at org.apache.roller.weblogger.business.startup.DatabaseInstaller.getDatabaseVersion(DatabaseInstaller.java:1169)	at org.apache.roller.weblogger.business.startup.DatabaseInstaller.isUpgradeRequired(DatabaseInstaller.java:99)	at org.apache.roller.weblogger.business.startup.WebloggerStartup.prepare(WebloggerStartup.java:201)	at org.apache.roller.weblogger.ui.core.RollerContext.contextInitialized(RollerContext.java:138)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3830)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)	at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:553)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)