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Re: [platform-releng-dev] Warnings in latest builds
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Olivier,
Can you please explain how we should determine the value for the
serialVersionUID field and under what conditions it should be updated?
Thank you,
Veronika
Olivier Thomann/Ottawa/IBM@IBMCA
Sent by: platform-releng-dev-admin@xxxxxxxxxxx
11/17/2004 11:44 AM
Please respond to
platform-releng-dev
To
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Subject
[platform-releng-dev] Warnings in latest builds
Hi,
We found few different warnings in latest builds. The compiler has been
updated to a more recent version that reports more warnings. We believe it
makes sense to get rid of these warnings.
1) Missing serialVersionUID fields
In order to fix this one, you need to be sure to use the definition of the
class when it has been created. Otherwise serialized instances of the
classes won't be able to be deserialized. When the serialVersionUID field
is not provided and the default serialization is used, the serialized
instances are compiler-dependant. Updated versions of the Eclipse compiler
might break the deserialization of the instances. More likely if another
compiler is used (jikes, javac).
2) 'enum' as an identifier.
In order to prevent problems when the source is compiled with a 1.5
compiler, this identifier has to be renamed. Thanks to the wonderful
refactoring feature, it is extremely easy to fix this warning. In 1.5,
enum is a keyword and therefore cannot be used as an identifier.
3) Assignment has no effect.
This one is reported when trying to assign the same local of instance
variable into itself. Trivial to fix.
4) hidden method doesn't override ...
This is when a method is defined in a subclass and it doesn't override the
one from the superclass due to visibility problem. This can be
intentional, but it is confusing when reading the code. So the best is to
rename the method.
5) static fields accessed in a non-static way
This is reported when accessing a static field using a receiver. Only the
class name should be used. In this case, the static fields are accessed
using 'super.'. This is not required.
Hope this helps to fix these warnings. The sooner, the better.
Olivier
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
Here is a summary of the warnings found in the latest build:
org.apache.lucene
3 missing serialVersionUID fields
org.eclipse.ant.core:
1 missing serialVersionUID field
org.eclipse.ant.tests.ui:
1 missing serialVersionUID field
org.eclipse.ant.ui:
2 missing serialVersionUID fields
org.eclipse.ant.ui: (remoteAnt.jar)
1 missing serialVersionUID field
org.eclipse.core.runtime:
1 missing serialVersionUID field
org.eclipse.debug.core:
2 missing serialVersionUID fields
org.eclipse.ftp:
3 missing serialVersionUID fields
org.eclipse.help.base:
5 missing serialVersionUID fields
org.eclipse.help.webapp: (jsp.jar)
46 missing serialVersionUID fields
org.eclipse.help.webapp: (servelts.jar)
6 missing serialVersionUID fields
org.eclipse.help:
1 missing serialVersionUID field
org.eclipse.jdt.debug: (jdi.jar)
24 missing serialVersionUID fields
org.eclipse.jdt.debug: (jdimodel.jar)
7 missing serialVersionUID fields
org.eclipse.jdt.launching:
1 missing serialVersionUID field
org.eclipse.jdt.ui.tests:
1 missing serialVersionUID field
org.eclipse.jdt.ui:
2 missing serialVersionUID fields
org.eclipse.jface:
9 missing serialVersionUID fields
org.eclipse.osgi: (console.jar)
3 enum as identifier
org.eclipse.osgi: (core.jar)
29 enum as identifier
11 missing serialVersionUID fields
org.eclipse.osgi: (defaultAdaptor.jar)
2 enum as identifier
org.eclipse.osgi: (eclipseAdaptor.jar)
9 enum as identifier
2 missing serialVersionUID fields
org.eclipse.osgi: (osgi.jar)
2 enum as identifier
13 missing serialVersionUID fields
org.eclipse.osgi: (resolver.jar)
2 missing serialVersionUID fields
org.eclipse.pde.build:
6 enum as identifier
org.eclipse.pde.core:
58 missing serialVersionUID fields
org.eclipse.pde.ui:
11 missing serialVersionUID fields
org.eclipse.search:
2 missing serialVersionUID fields
org.eclipse.swt.carbon:
40 missing serialVersionUID fields
org.eclipse.swt.gtk64: (swt-mozilla.jar)
637 static fields accessed in a non-static way
org.eclipse.swt.gtk64: (swt.jar)
40 missing serialVersionUID fields
org.eclipse.swt.gtk: (swt-mozilla.jar)
637 static fields accessed in a non-static way
org.eclipse.swt.gtk: (swt.jar)
40 missing serialVersionUID fields
org.eclipse.swt.motif: (swt-mozilla.jar)
637 static fields accessed in a non-static way
org.eclipse.swt.motif: (swt.jar)
40 missing serialVersionUID fields
2 hidden methods don't override ...
org.eclipse.swt.photon:
40 missing serialVersionUID fields
org.eclipse.swt.win32:
40 missing serialVersionUID fields
5 hidden methods don't override ...
org.eclipse.test
3 enum as identifier
1 missing serialVersionUID field
org.eclipse.ui.cheatsheets
6 enum as identifier
1 missing serialVersionUID field
org.eclipse.ui.forms
2 missing serialVersionUID fields
org.eclipse.ui.ide
39 enum as identifier
org.eclipse.ui.presentation:
1 missing serialVersionUID field
1 hidden method doesn't override ...
org.eclipse.ui.tests
1 assignment to variable has no effect
org.eclipse.ui.views
3 enum as identifier
org.eclipse.ui.workbench
109 enum as identifier
11 missing serialVersionUID fields
org.eclipse.update.configurator
1 missing serialVersionUID field
org.eclipse.update.core
7 missing serialVersionUID fields
3 enum as identifier
org.eclipse.update.ui
4 missing serialVersionUID fields
6 enum as identifier
org.eclipse.webdav
22 enum as identifier
13 missing serialVersionUID fields
