Java 6 Update 10 breaks Flex compiler!

I just want to share this problem I found so maybe someone can save some time..

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Today while surfing the net I received a notification of an update of my Java installation to the Update 10 in order to see correctly the contents of that site.. bla bla bla..

Sometime later I switched to Flex and at the first execution of my ant script for compiling a flex project I suddenly received this beautiful error:

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[exec] Error: java/security/MessageDigest
[exec] java.lang.NoClassDefFoundError: java/security/MessageDigest
[exec]     at java.io.ObjectStreamClass.computeDefaultSUID(Unknown Source)
[exec]     at java.io.ObjectStreamClass.access$100(Unknown Source)
[exec]     at java.io.ObjectStreamClass$1.run(Unknown Source)
[exec]     at java.security.AccessController.doPrivileged(Native Method)
[exec]     at java.io.ObjectStreamClass.getSerialVersionUID(Unknown Source)
[exec]     at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
[exec]     at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
[exec]     at java.io.ObjectInputStream.readClassDesc(Unknown Source)
[exec]     at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
[exec]     at java.io.ObjectInputStream.readClassDesc(Unknown Source)
[exec]     at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
[exec]     at java.io.ObjectInputStream.readObject0(Unknown Source)
[exec]     at java.io.ObjectInputStream.readObject(Unknown Source)
[exec]     at flex.util.SerializedTemplateFactory.load(SerializedTemplateFactory.java:30)
[exec]     at flex2.compiler.util.VelocityManager.getTemplate(VelocityManager.java:162)
[exec]     at flex2.compiler.util.VelocityManager.getTemplate(VelocityManager.java:151)
[exec]     at flex2.compiler.util.VelocityManager.getTemplate(VelocityManager.java:137)
[exec]     at flex2.compiler.as3.genext.GenerativeSecondPassEvaluator.generateSupportCode(GenerativeSecondPassEvaluator.java:256)
[exec]     at flex2.compiler.as3.genext.GenerativeSecondPassEvaluator.modifySyntaxTree(GenerativeSecondPassEvaluator.java:355)
[exec]     at flex2.compiler.as3.binding.BindableSecondPassEvaluator.evaluate(BindableSecondPassEvaluator.java:102)
[exec]     at macromedia.asc.parser.ClassDefinitionNode.evaluate(ClassDefinitionNode.java:106)
[exec]     at flash.swf.tools.as3.EvaluatorAdapter.evaluate(EvaluatorAdapter.java:338)
[exec]     at macromedia.asc.parser.StatementListNode.evaluate(StatementListNode.java:60)
[exec]     at flash.swf.tools.as3.EvaluatorAdapter.evaluate(EvaluatorAdapter.java:923)
[exec]     at macromedia.asc.parser.ProgramNode.evaluate(ProgramNode.java:80)
[exec]     at flex2.compiler.as3.genext.GenerativeExtension.parse2(GenerativeExtension.java:114)
[exec]     at flex2.compiler.as3.Compiler.parse2(Compiler.java:386)
[exec]     at flex2.compiler.API.parse2(API.java:2390)
[exec]     at flex2.compiler.API.parse2(API.java:2348)
[exec]     at flex2.compiler.API.batch2(API.java:375)
[exec]     at flex2.compiler.API.batch(API.java:1117)
[exec]     at flex2.compiler.API.compile(API.java:1290)
[exec]     at flex2.compiler.API.compile(API.java:1210)
[exec]     at flex2.tools.Compc.compc(Compc.java:158)
[exec]     at flex2.tools.Compc.main(Compc.java:41)

Academic Writing so I tried also to compile another project before go crazy, but I got this another java funny error, which was more or less unreadable as the previous one!

Master Thesis Review Fortunately I remembered the update I did of Java! And in fact after remove that update everything worked again!