As of 1.2.0, Simplestub is built using the ASM library; it is still possible to use the older Javassist-based implementation simply by having Javassist on the classpath instead of ASM:
In Maven, you can accomplish this by using the following to depend on SimpleStub and Javassist:
<dependency> <group>com.meterware.simplestub</group> <artifact>simplestub</artifact> <version>(version number)</version> <scope>test</scope> <exclusions> <exclusion> <groupId>org.ow2.asm</groupId> <artifactId>asm</artifactId> </exclusion> <exclusion> <groupId>org.ow2.asm</groupId> <artifactId>asm-commons</artifactId> </exclusion> </exclusions> </dependency> <dependency> <group>org.javassist</group> <artifact>javassist</artifact> <version>3.18.1-GA</version> <scope>test</scope> </dependency>