BufferedImageHttpMessageConverter doesn't work on Google AppEngine [SPR-5975]

[spring-projects-issues]

Andrey Paramonov opened SPR-5975 and commented

After upgrading Spring version to 3.0.0, application deployed on GAE fails with exception:

Caused by: java.lang.NoClassDefFoundError: javax.imageio.ImageIO is a restricted class. Please see the Google App Engine developer's guide for more details.
	at com.google.apphosting.runtime.security.shared.stub.javax.imageio.ImageIO.<clinit>(ImageIO.java)
	at org.springframework.http.converter.BufferedImageHttpMessageConverter.<init>(BufferedImageHttpMessageConverter.java:70)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.<init>(AnnotationMethodHandlerAdapter.java:166)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Constructor_.newInstance(Constructor_.java:60)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:127)

See also: http://code.google.com/p/googleappengine/issues/detail?id=1268

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Affects: 3.0 M3

Referenced from: commits 4267f84

[spring-projects-issues]

Juergen Hoeller commented

Arjen, can we somehow reflectively check whether to register that default BufferedImageHttpMessageConverter there? Or do some late initializiation of those default converters?

I wonder whether a Class.forName("javax.imageio.ImageIO") check actually works on a GAE: Is the class present and not usable there, or not present at all - in the sense of not visible in the ClassLoader?

Juergen

[spring-projects-issues]

Dave Syer commented

Class.formName("javax.imageio.ImageIO") does not fail on GAE. It returns a proxy with some other type ("com.google.apphosting.runtime.security.shared.stub.javax.imageio.ImageIO") which then barfs if you try and use it.

[spring-projects-issues]

Arjen Poutsma commented

Thanks for investigating, Dave. I guess I will just remove the BufferedImageHttpMessageConverter as a default, so that it has to be enabled explicitly.

[spring-projects-issues]

Arjen Poutsma commented

BufferedImageHttpMessageConverter removed as default.

[spring-projects-issues]

Andrey Paramonov commented

Issue resolved. Thanks Arjen.