Bug 96570

Summary:	Compile Error in FeatureWriter.java
Product:	[Eclipse Project] JDT	Reporter:	Gunnar Wagenknecht <gunnar>
Component:	Core	Assignee:	Kent Johnson <kent_johnson>
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	P3
Version:	3.1
Target Milestone:	3.1 RC4
Hardware:	PC
OS:	Windows XP
Whiteboard:

Description Gunnar Wagenknecht

2005-05-25 04:49:46 EDT

3.1M7

My workspace is configured to use JDK 1.5.0_02 and the compiler compilance level
is set to 5.0. I've checked out org.eclipse.pde.build from HEAD into this
workspace. This project uses a project specific setting for 1.4 compatibility. 

I get the following compile errors for 
org.eclipse.pde.build/src/org/eclipse/pde/internal/build/FeatureWriter.java

Severity	Description	Resource	In Folder	Location
Creation Time
2	The return type is incompatible with Writer.append(char),
PrintWriter.append(char)	FeatureWriter.java
org.eclipse.pde.build/src/org/eclipse/pde/internal/build	line 24
24. Mai 2005 07:16:07
2	The return type is incompatible with Writer.append(CharSequence,
int, int), PrintWriter.append(CharSequence, int, int) FeatureWriter.java
org.eclipse.pde.build/src/org/eclipse/pde/internal/build	line 24
24. Mai 2005 07:16:07
2	The return type is incompatible with
Writer.append(CharSequence), PrintWriter.append(CharSequence) FeatureWriter.java
org.eclipse.pde.build/src/org/eclipse/pde/internal/build	line 24
24. Mai 2005 07:16:07

FeatureWriter extends XMLWriter which extends PrintWriter. The methods in
question arn't overwritten in FeatureWriter. Any ideas why these errors are
generated?

Comment 1 Philipe Mulet

2005-05-25 05:11:25 EDT

Kent: if 1.4 compliance is enabled, we usually want to behave against 1.5 libs
still as much as possible (but not more).

Comment 2 Philipe Mulet

2005-05-25 05:12:50 EDT

I suspect though in this case, we get abused by covariance methods in 1.5
libraries, and cannot ignore them.

A simple test would be to compile same sample using javac 1.4 against 1.5 libs.

Comment 3 Philipe Mulet

2005-06-21 09:44:33 EDT

Closing. We cannot perform in 1.4 against covariant libs.