awslabs / awslabs/amazon-kinesis-client-nodejs
Unable to use KCL for nodejs v2.2.6 in java 1.8
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- JavaScript
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Description
Here is my java version (1.8.0_422)

I tried to use the KCL for nodejs v2.2.6 (https://github.com/awslabs/amazon-kinesis-client-nodejs/releases/tag/v2.2.6). But the **\samples\basic_sample\consumer\kcl-bootstrap** doesn't work fine and fails to start up. But it works fine in java 11. But as per the documentaiton it says, it should work fine with java 1.8 or above. Could anyone confirm what is the version of java supported for
**Logs:**
Starting MultiLangDaemon ...
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: ch/qos/logback/core/joran/spi/JoranException has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: ch/qos/logback/core/joran/spi/JoranException has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
Exception in thread "main" java.lang.UnsupportedClassVersionError: ch/qos/logback/core/joran/spi/JoranException has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2729)
at java.lang.Class.privateGetMethodRecursive(Class.java:3076)
at java.lang.Class.getMethod0(Class.java:3046)
at java.lang.Class.getMethod(Class.java:1812)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:670)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:652)
Contributor guide
Research direction
Start with samples/basic_sample/consumer/kcl-bootstrap and the v2.2.6 release setup, then compare its Java 8 and Java 11 startup behavior using the provided UnsupportedClassVersionError logs. Trace the dependency or launcher involved in loading JoranException; done means the sample starts under the documented Java version, or the supported version is clearly corrected.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- aws, java, javascript, node.js
- Domain
- distributed-systems, stream-processing
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100