Java – catch parameter parsing exception in spring 3.0 webmvc

I use spring webmvc to provide rest APIs The way I use is like

@Requestmapping ("/ path ({ID}") void getbyid (@ pathvariable ("Id") int ID) {} method

When the client mistakenly puts a string instead of an integer ID into the query, I get a numberformatexception, such as:

java.lang.NumberFormatException: For input string: "dojo"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    at java.lang.Long.parseLong(Long.java:410)
    at java.lang.Long.valueOf(Long.java:525)
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:158)
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:59)
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:1)
    at org.springframework.core.convert.support.GenericConversionService$ConverterFactoryAdapter.convert(GenericConversionService.java:420)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:37)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:135)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:199)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:104)
    at org.springframework.beans.SimpleTypeConverter.convertIfNecessary(SimpleTypeConverter.java:47)
    at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:526)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolvePathVariable(HandlerMethodInvoker.java:602)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:289)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:163)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)

My question is now, how can I grasp it gracefully? I know spring provides the @ exeptionhandler annotation, but I don't want to catch NFE in general I hope to catch all parsing exceptions to provide a good error message to the client

Any ideas?

Cheers!

January

Solution

Is this a practical exception? (it doesn't match your code example) usually people want to wrap it in org springframework. beans. This may be specific in typemismatch exception, for which you can write the @ exceptionhandler method

If this is not specific enough, you will need to abandon spring magic and change the parameter type to string to resolve it yourself Then you can deal with it the way you like