<version>2.1-SNAPSHOT</version>
        <executions>
          <execution>
            <id>equal-build-exec-id</id>
            <phase>initialize</phase>
            <goals>
              <goal>reset</goal>
            </goals>
            <configuration>
              <logFile>target/exec.log</logFile>
              <string>test</string>
            </configuration>
          </execution>
        </executions>

        private boolean sourceLevelSet = false;

        public void setSourceLevel(String sourceLevel) {
            if (sourceLevelSet) {
                throw new IllegalStateException("Cannot reset sourceLevel attribute; it is already set to: " + sourceLevel);
            } else if (!(USER_LEVEL.equals(sourceLevel) || GLOBAL_LEVEL.equals(sourceLevel))) {