What is the last version of Selenium for Java 5?

I’m obliged to use Java 5 to implement Selenium tests (precisely JDK 1.5.22) and classes of the last version of Selenium (2.42.2) are compiled in Java 6 or more.

What is the last version of Selenium I can use?

For information, I use Selenium through Maven:

<dependency>
      <groupId>org.seleniumhq.selenium</groupId>
      <artifactId>selenium-java</artifactId>
      <version>2.42.2</version>
      <scope>test</scope>
</dependency>

Answer

The project changelog says:

v2.22.0
=======

WebDriver:
  * JRE dependency upped to Java 6.

which implies that v2.21.0 still supported Java 5. Checking the pom for that release shows:

<plugin>
  <artifactId>maven-compiler-plugin</artifactId>
  <configuration>
    <source>1.5</source>
    <target>1.5</target>

so that looks like a good place to start.

Note that JDK 5 has been unsupported since 2009.