Thursday, July 14, 2011

Java 7 Support in Eclipse JDT (BETA) - Part II

I have already talked about the new features to support multi-catch in an earlier post. Now I will talk about Try-with-resources statement and Simplified Varargs Method Invocation.

The compiler detects unhandled exceptions thrown by automatic/implicit close() invocation on a resource.  

With Mark Occurrences enabled, the closing '}' of a try-with-resources statement is marked as a method exit point if the implicit close() invocation throws an exception. The corresponding resource variable is also highlighted.

Future items: In 3.8 we plan to add warnings to indicate that a resource is not closed, see bug 349326. In Java 7 a resource is a subtype of java.lang.AutoCloseable and in the pre-Java 7 world a resource is a subtype of Based on these warnings we will also provide quick fixes/assists and clean-ups to enclose a resource in a try-with-resources statement, see bug 349390.

A new quick fix Add @SafeVarargs is offered for potential heap pollution warnings on method declarations.

Add @SafeVarargs quick fix is also offered from call sites.

Remove @SafeVarargs quick fix is offered for incorrect usage of @SafeVarargs annotation.

Note: This is an implementation of an early-draft specification developed under the Java Community Process (JCP) and is made available for testing and evaluation purposes only. The code is not compatible with any specification of the JCP.

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