DDevelopment & Design

JAXB and unmappable character for encoding UTF-8

Using locale specific characters in schema or wsdl (i.e. for documentation purpose) is still quite problematic. Especially if you are using JAXB to generate wsdl2java java classes. Because JAXB uses default system encoding and classes are usually compiled in UTF-8 special chars in java comments resolves in compilations error:

/url/to/file/SomeFile.java:[11,12] unmappable character for encoding UTF-8 A workaround to this problem is to isolate wsdl2java code generation in a dedicated maven module and to configure the compiler plugin to use OS dependant encoding:

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <encoding>${file.encoding}</encoding>
        </configuration>
</plugin>

More info related to this topic:

here

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DDevelopment & Design

Grails render as JSON catch

One of a reasons your controller doesn't render a proper response in JSON format might be wrong package name that you use. It is easy to overlook. Import are on top of a file, you look at your code and everything seems to be fine. Except response is still not in JSON format.

Consider this simple controller:

class RestJsonCatchController {
def grailsJson() {
render([first: 'foo', second: 5] as grails.converters.JSON)
    }

def netSfJson() {
render([first: 'foo', second: 5] as net.sf.json.JSON)
    }
}

And now, with finger crossed... We have a winner!

$ curl localhost:8080/example/restJsonCatch/grailsJson
{"first":"foo","second":5}
$ curl localhost:8080/example/restJsonCatch/netSfJson
{first=foo, second=5}

As you can see only grails.converters.JSON converts your response to JSON format. There is no such converter for net.sf.json.JSON, so Grails has no converter to apply and it renders Map normally.

Conclusion: always carefully look at your imports if you're working with JSON in Grails!

Edit: Burt suggested that this is a bug. I've submitted JIRA issue here: GRAILS-9622 render as class that is not a codec should throw exception

DDevelopment & Design

Sygnalizacyjne ABC

  • byTouK
  • August 1, 2008
Poniższy artykuł oparty jest na wspaniałej pozycji książkowej “System Sygnalizacji nr 7 G. Danielewicz, W.Kabaciński”. Gorąco zachęcam do…