Develop Reference

class file has wrong version 62.0, should be 57.0 - While building Jar

I have downloaded Java code from GitHub and am trying to configure or build my changes into a Java package. But I'm getting the below error. I'm not sure what version of Java I need to use to build this project. Any pointers or suggestions would be really helpful.
error: cannot access Copier
import com.example.records.core.Copier;
^
bad class file: /home/user957/.gradle/caches/modules-2/files-2.1/com.example.streaming/streaming-core/v1.36.1/758f1477d776e3273c5397d2d5d7e19b5fa46326/streaming-core-v1.36.1-sdk.jar(/com/example/records/core/Copier.class)
class file has wrong version 62.0, should be 57.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
mySystem JDK version
java -version
openjdk version "18.0.2.1" 2022-08-18
OpenJDK Runtime Environment Temurin-18.0.2.1+1 (build 18.0.2.1+1)
OpenJDK 64-Bit Server VM Temurin-18.0.2.1+1 (build 18.0.2.1+1, mixed mode, sharing)

Try JDK version 1.9 or higher.
If class files has version 62.0,then least JDK 9 installed on system to be able to compile them

I solved this problem, by just reinstalling my JDK. If you're using IntelliJ, just head to the project settings and click download in the JDK dropdown menu.
I also solved this problem on my Ubuntu 20.04 machine by running sudo apt install openjdk-13-jdk, which installs the jdk and
sudo update-alternatives --config java, which updates the index of the newest jdk (i think).
If I understood you wrongly with the version needed, just adjust the number behind openjdk- to whatever version you need.
All versions to their corresponding class file versions

Visual Studio Code not detecting java 17 installed even though java 17 was installed via a link gotten from vsc

So I recently installed OpenJDK 17 for Linux and it came to me as a tar.gz file. I installed it after clicking a link I got on vs code after installing a java extension pack (I had Java 11 installed by default, but I decided to get the latest version), under the adoptium's temurin tab of installing Java from vsc. So after doing so I reloaded the screen, but still no change. Vs code is still not detecting java 17 or 11 is installed. Also when I type java --version in the terminal, I get :
OpenJDK 11.0.11 2021-04-20
OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04)
OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing)
How do I make Java 17 the default version for VSC?

You've added jDK11 to PATH, discard this configuration then add jdk17 to PATH.
Then turn to VS Code, open User Settings.json and add
"java.home": "<path to jdk17>",
Then reload window to make this change effective.

I did the following steps to fix the issue(I use Debian based Linux OS):
Went to my software manager, searched for JDK 11.
Deleted JDK 11 and installed JDK 17 from the software manager
Went to VSC and installed an extension "java run".
Ran the code and it worked just fine.

NetBeans 12.4 "Warning - could not install some modules: JavaFX wrapper"

I get the following message after exiting out of NetBeans and then re-starting.
Warning - could not install some modules: JavaFX wrapper - No module providing the capability org.openide.modules.jre.JavaFX could be found. Another module could not be installed due to the above problems.
I am using Java 15, with JavaFX. I didn't have the issue with 12.3 and Java 15, but now I get it at least once a day, depending on how often I leave and re-enter.
I have a work-around. I replace the NetBeans cache with a clean copy kept for this purpose, and I can then restart and continue working without the error, but this is a bit tedious after the first couple of times, each day.
Product Version: Apache NetBeans IDE 12.4
Java: 15.0.4; OpenJDK 64-Bit Server VM 15.0.4+5-MTS
Runtime: OpenJDK Runtime Environment 15.0.4+5-MTS
System: Windows 10 version 10.0 running on amd64; UTF8; en_AU (nb)

I have found the solution, I have re-installed, and skipped the installation of the nb-javac plugin. I had forgotten that I did this on my older installations, until I re-read the post below. Everything is fine now.
NetBeans plugin fails if nb-javac installed
What's "nb-javac" in Apache NetBeans?

netbeans project collapses tree menu

NetBeans project collapses tree menu, but this did not occur earlier.
Product Version: NetBeans IDE 7.4 (Build 201310111528)
NetBeans IDE NetBeans 7.4 Patch 2
Java: 1.7.0_45; Java HotSpot(TM) 64-Bit Server VM 24.45-b08
Runtime: Java(TM) SE Runtime Environment 1.7.0_45-b18
System: Windows 7 version 6.1 running on amd64; Cp1251; ru_RU (nb)

Usually for that kind of issues there is no solution. Try to report the bug to the netbeans community if it is not already reported. If you want to have a clear solution to your problem change you netbeans to an earliest version or reinstall this particular version.
PS: You should update you Java version to the latest one (1.7.0_51).

there may be some issues with the istallation processes try
1) reinstaiing
2) changing perspective mode
3) refeshing project

The problem may be with your Netbeans compatibility, because you are using 64 bit system. Your Netbeans is might be compatible with 32 bit system only. Or other possible thing is that Netbeans is not installed properly.
So to solve this problem you can do this:
Reinstall Netbeans
Search for 64 bit compatible Netbeans version, Download it, and then install it properly.
Delete your existing project and create a new project.

Not able to open already created Java ME project in NetBeans

I was using the NetBeans IDE 7.3, however on open an existing mobility project I get lots of red dots,
on rolling over the dot near the package statement it says
'cannot access java.lang"
Fatal Error:" Unable to find package java.lang in classpath or bootclasspath"
while the other red dots below near other class or Identifier statements say
"cannot find symbol."
I have JDK 1.7.0_11 installed.
I tried the following to correct the errors:
1. Reinstalled JDK 1.7 .
2. Reinstalled NetBeans 7.3.
3. Uninstalled NetBeans 7.3 and installed NetBeans 7.3
However nothing worked.
Product Version: NetBeans IDE 7.3 (Build 201302132200)
Updates: Updates available
Java: 1.7.0_11; Java HotSpot(TM) Client VM 23.6-b04
Runtime: Java(TM) SE Runtime Environment 1.7.0_11-b21
System: Windows Vista version 6.0 running on x86; Cp1252; en_US (nb)
User directory: C:\Users\SSNEHAL\AppData\Roaming\NetBeans\7.3
Cache directory: C:\Users\SSNEHAL\AppData\Local\NetBeans\Cache\7.3
I also searched google but could not find any valid answers.
What should I do?
Interestingly I get these errors only on Mobility projects and that too on opening an existing Mobility project,
New Mobility and J2SE projects dont give me any errors.

If new projects work, Netbeans probably lost the platform configuration for your project (this happened to me once). To reconfigure it go to Project Properties -> Platform and set the Platform Type and Emulator to your JavaME platform.