Exception in thread "main" java.lang.NoSuchMethodError: java.nio.ByteBuffer.rewind()Ljava/nio/ByteBuffer;

[onestow]

My JDK version is 1.8, milvus-sdk-java version is 2.4.0, when I run SearchResultsWrapper.getIDScore, and I got the exception:

Exception in thread "main" java.lang.NoSuchMethodError: java.nio.ByteBuffer.rewind()Ljava/nio/ByteBuffer;
	at io.milvus.response.FieldDataWrapper.getFieldData(FieldDataWrapper.java:248)
	at io.milvus.response.FieldDataWrapper.valueByIdx(FieldDataWrapper.java:351)
	at io.milvus.response.SearchResultsWrapper.getIDScore(SearchResultsWrapper.java:207)
	at com.tom.MilvusTest.myTest(MilvusTest.java:190)
	at com.tom.MilvusTest.main(MilvusTest.java:114)

how to solve it?

[onestow]

jdk21 is normal jdk8 is not support?

[xiaofan-luan]

https://www.morling.dev/blog/bytebuffer-and-the-dreaded-nosuchmethoderror/

[xiaofan-luan]

this is a java compilation bug need to be fixed.

@onestow would you mind fix that?

[onestow]

I'm sorry, but I haven't had time for anything else recently v_v

[xiaofan-luan]

/assign @yhmo could you help on it?

[yhmo]

Java SDK is compiled by openjdk 11 with language level 8. Seems this is an issue of ByteBuffer. If it cannot run under jdk 1.8, try use jdk 11 instead. I need to install 1.8 to test the issue first, I am not sure is any quick solution there.

[xiaofan-luan]

check the link

... <maven.compiler.release>8</maven.compiler.release> ...

[yhmo]

maven.compiler.release doesn't resolve this issue.

I tested on my local.

• compile sdk with openjdk 1.8 and language level 8 run client with openjdk 1.8 and language level 8, the ByteBuffer works fine run client with openjdk 11 and language level 8, the ByteBuffer works fine

• compile sdk with openjdk 11 and language level 8 run client with openjdk 1.8 and language level 8, get NoSuchMethod error of ByteBuffer such as rewind()/position() run client with openjdk 11 and language level 8, the ByteBuffer works fine

[yhmo]

A possible solution is: compile the SDK with OpenJDK 1.8 and language level 8 from the next version.

There is a potential problem: seems the tensorflow-core-platform could not work under openjdk 1.8. (Currently, we use this lib for Float16Vector examples).

java: cannot access org.tensorflow.ndarray.buffer.ByteDataBuffer
  bad class file: /home/yhmo/.m2/repository/org/tensorflow/ndarray/0.4.0/ndarray-0.4.0.jar!/org/tensorflow/ndarray/buffer/ByteDataBuffer.class
    class file has wrong version 55.0, should be 52.0
    Please remove or make sure it appears in the correct subdirectory of the classpath.