Cannot build in Intellij - Could not find or load main class

ZagButNoZig · March 26, 2020, 9:34pm

When building a jar in intellij withe the following pom.xml

    <properties>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.source>1.8</maven.compiler.source>
    <kotlin.version>1.3.61</kotlin.version>
</properties>

org.deeplearning4j deeplearning4j-core 1.0.0-beta6

  <dependency>
      <groupId>org.nd4j</groupId>
      <artifactId>nd4j-api</artifactId>
      <version>1.0.0-beta6</version>
  </dependency>
  <dependency>
      <groupId>org.nd4j</groupId>
      <artifactId>nd4j-native</artifactId>
      <version>1.0.0-beta6</version>
  </dependency>
  <dependency>
      <groupId>org.deeplearning4j</groupId>
      <artifactId>deeplearning4j-ui</artifactId>
      <version>1.0.0-beta6</version>
  </dependency>
  <dependency>
      <groupId>org.freemarker</groupId>
      <artifactId>freemarker</artifactId>
      <version>2.3.29</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-math3 -->
  <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-math3</artifactId>
      <version>3.6.1</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
  <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.5</version>
  </dependency>
  <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib-jdk8</artifactId>
      <version>${kotlin.version}</version>
  </dependency>
  <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-test</artifactId>
      <version>${kotlin.version}</version>
      <scope>test</scope>
  </dependency>

<build>
    <plugins>
        <plugin>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-plugin</artifactId>
            <version>${kotlin.version}</version>
            <executions>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>test-compile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <jvmTarget>1.8</jvmTarget>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <executions>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                </execution>
                <execution>
                    <id>testCompile</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

I have followed every single step on java.lang.ClassNotFoundException when running in IntelliJ IDEA - Stack Overflow but when building it says “Could not find or load main class”. Why is that?

StoicProgrammer · March 27, 2020, 8:07am

Can you run your code inside IntelliJ?
The problem present itself only when building the JAR?
Can you post all the stacktrace?

treo · March 27, 2020, 8:14am

Can you share your full project? That kind of error can come from a few sources, and being able to take a look at your project structure in full context, will make debugging this a whole lot easier.

ZagButNoZig · March 27, 2020, 12:00pm

I fixed the issue by not selecting Libraries: “extract to the target JAR” but “copy to the output directory and link via manifest”. I think the issue was that all of the libraries were in the jar file and that somehow messed it up.
Is this a dl4j issue?

treo · March 27, 2020, 12:26pm

no, this sounds a lot like it is an issue with your project set up.

ZagButNoZig · March 27, 2020, 12:45pm

I build the project on a windows machine and ran it on a linux machine and I am getting a JRE Crash eveery time I run it is caused by nd4j.

A fatal error has been detected by the Java Runtime Environment:
SIGILL (0x4) at pc=0x00007f0e1ffb4a89, pid=11413, tid=11414
JRE version: OpenJDK Runtime Environment (11.0.6+10) (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
Java VM: OpenJDK 64-Bit Server VM (11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode, sharing, tiered, compressed oops, serial gc, linux-amd64)
Problematic frame:
C [libnd4jcpu.so+0x57efa89] nd4j::OpTracker::getInstance()+0x29

--------------- S U M M A R Y ------------

Command Line: ./myJar.jar

Host: Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz, 1 cores, 897M, Ubuntu 18.04.4 LTS
Time: Fri Mar 27 12:41:23 2020 UTC elapsed time: 1 seconds (0d 0h 0m 1s)

--------------- T H R E A D ---------------

Current thread (0x00007f0e5c014000): JavaThread “main” [_thread_in_native, id=11414, stack(0x00007f0e65305000,0x00007f0e65406000)]

This is the dump I got. Works on windows btw

treo · March 27, 2020, 12:48pm

Can you please share the full crash log?

ZagButNoZig · March 27, 2020, 1:03pm

Yeah I forgot this part:

--------------- T H R E A D ---------------

Current thread (0x00007f8fe8014000): JavaThread “main” [_thread_in_native, id=1700, stack(0x00007f8ff27d7000,0x00007f$

Stack: [0x00007f8ff27d7000,0x00007f8ff28d8000], sp=0x00007f8ff28d31e0, free space=1008k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [libnd4jcpu.so+0x57efa89] nd4j::OpTracker::getInstance()+0x29

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j java.lang.ClassLoader$NativeLibrary.load0(Ljava/lang/String;Z)Z+0 java.base@11.0.6
j java.lang.ClassLoader$NativeLibrary.load()Z+53 java.base@11.0.6
j java.lang.ClassLoader$NativeLibrary.loadLibrary(Ljava/lang/Class;Ljava/lang/String;Z)Z+216 java.base@11.0.6
j java.lang.ClassLoader.loadLibrary0(Ljava/lang/Class;Ljava/io/File;)Z+46 java.base@11.0.6
j java.lang.ClassLoader.loadLibrary(Ljava/lang/Class;Ljava/lang/String;Z)V+48 java.base@11.0.6

treo · March 27, 2020, 1:20pm

I meant the whole file that is created when the jvm crashes, it is usually called something like hs_XXX.log

ZagButNoZig · March 27, 2020, 2:11pm

gist.github.com

https://gist.github.com/ZagButNoZig/9f3e40ccce80c6cca27be439edf0b610

Crash

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGILL (0x4) at pc=0x00007f8facfd7a89, pid=1699, tid=1700
#
# JRE version: OpenJDK Runtime Environment (11.0.6+10) (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
# Java VM: OpenJDK 64-Bit Server VM (11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode, sharing, tiered, compressed oops, serial gc, linux-amd64)
# Problematic frame:
# C  [libnd4jcpu.so+0x57efa89]  nd4j::OpTracker::getInstance()+0x29
#

This file has been truncated. show original

treo · March 27, 2020, 2:15pm

@raver119 any idea what is going on here?

raver119 · March 27, 2020, 2:21pm

SIGILL means that you have built your project for one cpu arch, and trying to run it on a another one, so processor sees unsupported instruction. I.e. you’ve built binary for avx512 and trying to run binary on non-avx512 CPU.

raver119 · March 27, 2020, 2:21pm

p.s. the same applies to “native” builds.

ZagButNoZig · March 27, 2020, 2:34pm

Ok so I have 3 nd4j native files.

nd4j-native-1.0.0-beta6.jar
nd4j-native-1.0.0-beta6-windows-x86_64.jar
nd4j-native-api-1.0.0-beta6.jar

So I assume I am missing the linux natives? Where do I get them from?

raver119 · March 27, 2020, 2:37pm

That’s separate story, because this fact won’t give you SIGILL. But yes, you do miss those. You can get them either by using native-platform artifact, or specify platform binaries with classifiers

ZagButNoZig · March 27, 2020, 2:43pm

So… how would I fix my issue?

raver119 · March 27, 2020, 2:48pm

<dependency>
      <groupId>org.nd4j</groupId>
      <artifactId>nd4j-native-platform</artifactId>
      <version>1.0.0-beta6</version>
  </dependency>

Use this instead of nd4j-native dependency.

ZagButNoZig · March 27, 2020, 3:08pm

I did that. Deleted full maven repo and ran mvn install but the nd4j linux native is still missing.

raver119 · March 27, 2020, 3:13pm

It’s not possible, sorry. Maven must provide you with all possible artifacts, or provide meaningful error message.

Topic		Replies	Views
ND4J compile from source fails with snapshot ND4J	6	2376	May 3, 2021
Opening the source code in IntelliJ DL4J	4	357	September 17, 2021
Build Documentation out of date? DL4J	33	2418	March 2, 2020
Trouble Installing on Android Device Running Arm Processor DL4J	55	2404	April 7, 2021
Compile/Test Deeplearning4j in Intellij DL4J	1	349	June 18, 2021

Cannot build in Intellij - Could not find or load main class

Related topics