Hi guys,
I have a strange problem with one generics code found in one GWT
library. This compile fine with java 6 but not with java 5.
In fact I can compile it in eclipse with java 5, so this problem appears
only when compiling with maven.
I reproduced this error with this code:
class:
-----------------------------------
public class DogBean {
transient protected Object bean;
public <X> X getBean()
{
return (X) bean;
}
public void setBean(Object bean)
{
this.bean = bean;
}
}
--------------------------------
Call to this class (simplified):
----------------------------------
DogBean stack = new DogBean();
stack.setBean("My doggie");
if(stack.getBean() instanceof String)
{
System.out.println("GermanShepherd");
}
--------------------------------
I get this error on: if(stack.getBean() instanceof String)
-------------------------------------
[INFO] Compilation failure
/home/milan/projects/eclipse/workspace2/Generics/src/main/java/main/SomeClass.java:[24,32]
unexpected type
found : java.lang.Object
required: reference
------------------------------
This is my pom.xml - only one plugin.
pom.xml:
-----------------------------------------------
...
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</build>
...
--------------------------------
Maven version:
--------------------------------
Apache Maven 2.2.1 (r801777; 2009-08-06 21:16:01+0200)
-----------------------
maven command used
--------------------------------
mvn clean install
--------------------------------
When I build it with jdk6 I can compile it without problem. But when I
use jdk5 when building, I get that error.
Problem is our build server use runs on jdk5, as some of our customers
do use jre 5.
I can cast this code like this:
if((Object)stack.getBean() instanceof String)
Then it compiles OK both with jdk5 and jdk6. but this is both ugly and dirty
But where is the problem?
I don't get this error under eclipse(neither under jd5 or jdk6) only
when building with maven
Any clues? Just ask for more info.
Regards,
Milan Chudík
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