java.lang.NoSuchMethodError when calling jfr2flame with jdk 8

[maozhu1123]

Environment: async-profiler v2.9 & jdk 8

> java -cp converter.jar jfr2flame --cpu java_profile.jfr test.html
Exception in thread "main" java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer;
        at one.jfr.JfrReader.<init>(JfrReader.java:78)
        at jfr2flame.main(jfr2flame.java:257)

> java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

[apangin]

The problem is known and has been fixed already. I'm closing the issue as a duplicate of #772