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Can't start web application in .WAR file : java.lang.ClassNotFoundException

I have a grails application written in Groovy. It is built and works when it's launched with :
./gradlew bootRun
Now I want to run it with java to put it in a Docker container. This is the Dockerfile I prepared :
FROM openjdk:8-jdk-alpine
ARG JAR_FILE=build/libs/*.war
ADD ${JAR_FILE} app.war
ENTRYPOINT ["java"]
CMD ["-Dgrails.env=development","-jar","app.war"]
The server fails to start because of the following error:
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [grails.boot.config.GrailsApplicationPostProcessor]: Factory method 'grailsApplicationPostProcessor' threw exception; nested exception is java.lang.ClassNotFoundException: com.flosslab.eGrocery.showcase.CmsTagLib
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 29 more
Caused by: java.lang.ClassNotFoundException: com.flosslab.eGrocery.showcase.CmsTagLib
When I checked the classes folder in WEB-INF, I found that the class is there in the correct path. I tried with a Tomcat setup, with Docker and without Docker and I'm still encountering the exact same error. I think something is wrong with the .WAR build. Here is the build.gradle file
build.gradle:
buildscript {
ext {
grailsVersion = project.grailsVersion
}
repositories {
mavenLocal()
maven { url "https://repo.grails.org/core" }
maven { url "https://repo.grails.org/grails/core" }
maven { url "https://plugins.gradle.org/m2/" }
}
dependencies {
classpath "org.grails:grails-gradle-plugin:$grailsVersion"
classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.5.0"
// classpath "org.grails.plugins:hibernate4:5.0.2"
classpath 'org.springframework:springloaded:1.2.8.RELEASE'
classpath "gradle.plugin.com.github.viswaramamoorthy:gradle-util-plugins:0.1.0-RELEASE"
}
}
version "1.0.49"
group "com.flosslab.egrocery"
apply plugin: "com.github.ManifestClasspath"
apply plugin: "eclipse"
apply plugin: "idea"
apply plugin: "war"
apply plugin: "org.grails.grails-web"
apply plugin: "org.grails.grails-gsp"
apply plugin: "asset-pipeline"
war.archiveName = "egrocery-showcase.war"
ext {
grailsVersion = project.grailsVersion
gradleWrapperVersion = project.gradleWrapperVersion
}
repositories {
mavenLocal()
maven { url "https://repo.grails.org/core" }
maven { url "https://repo.grails.org/grails/core" }
maven { url "http://192.168.12.16:8081/artifactory/egrocery-local" }
maven { url "http://192.168.12.16:8081/artifactory/libs-release-local" }
maven { url "http://192.168.12.16:8081/artifactory/plugins-release-local" }
mavenCentral()
}
dependencyManagement {
imports {
mavenBom "org.grails:grails-bom:$grailsVersion"
}
applyMavenExclusions false
}
def elasticsearchVersion = '5.6.8'
ext['elasticsearch.version'] = elasticsearchVersion
dependencies {
compile fileTree(dir: "libs", includes: ["*.jar"])
compile "com.flosslab.egrocery:domain:1.0.49"
compile "org.springframework.boot:spring-boot-starter-logging"
compile "org.springframework.boot:spring-boot-autoconfigure"
compile "org.springframework.boot:spring-boot-starter-actuator"
provided "org.springframework.boot:spring-boot-starter-tomcat"
compile "org.grails:grails-core"
compile "org.grails:grails-dependencies"
compile "org.grails:grails-web-boot"
compile "org.grails:grails-datastore-rest-client:5.0.3.RELEASE"
console "org.grails:grails-console"
profile "org.grails.profiles:web:$grailsVersion"
compile "org.grails.plugins:cache"
compile "org.grails.plugins:scaffolding"
compile "org.grails.plugins:hibernate4"
compile "org.grails.plugins:spring-security-rest:2.0.0.M2"
compile "org.grails.plugins:spring-security-rest-gorm:2.0.0.M2"
runtime "org.grails.plugins:asset-pipeline"
runtime group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.7'
runtime group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.7'
// compile group: 'org.elasticsearch', name: 'elasticsearch', version: elasticsearchVersion
// compile group: 'org.elasticsearch.client', name: 'transport', version: elasticsearchVersion
// compile "org.grails.plugins:elasticsearch:1.4.1"
compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.13'
compile "org.hibernate:hibernate-ehcache"
compile "org.grails.plugins:cache-ehcache:3.0.0.BUILD-SNAPSHOT"
compile "net.sf.ehcache:ehcache:2.10.2.2.21"
compile "net.sf.ehcache:ehcache-core:2.6.11"
compile "com.google.code.maven-play-plugin.net.tanesha.recaptcha4j:recaptcha4j:0.0.8"
runtime group: "org.postgresql", name: "postgresql", version: "42.1.4"
compile group: "net.java.dev.jna", name: "platform", version: "3.5.0"
compile group: "com.nimbusds", name: "nimbus-jose-jwt", version: "4.8"
compile group: "org.pac4j", name: "pac4j-core", version: "1.8.3"
compile "org.grails.plugins:fields"
testCompile "org.grails:grails-plugin-testing"
// testCompile "org.grails.plugins:geb"
testRuntime "org.seleniumhq.selenium:selenium-htmlunit-driver:2.47.1"
testRuntime "net.sourceforge.htmlunit:htmlunit:2.18"
}
configurations {
all {
exclude module: "bcmail-jdk14"
exclude module: "bctsp-jdk14"
exclude group: "com.google.guava", module: "guava"
exclude group: "com.google.guava", module: "guava-base"
}
}
task wrapper(type: Wrapper) {
gradleVersion = gradleWrapperVersion
}
assets {
minifyJs = true
minifyCss = true
}
gradle.properties:
grailsVersion=3.1.8
gradleWrapperVersion=2.11
Maybe there is something is lacking or something is wrong with the grails/groovy version ? I'm stuck for the entire day so I would appreciate your help.
Update :
Here is the Dockerfile I tried with Tomcat that I mentionned earlier. It gives me the exact same error.
FROM tomcat:8.5.75-jdk8-temurin
COPY egrocery-showcase.war /usr/local/tomcat/webapps
CMD ["catalina.sh", "run"]

I can't believe I wasted two days straight on this because someone wrote the package with an uppercase letter. There was a class in a package :
package com.flosslab.eGrocery.showcase
When I changed it to
package com.flosslab.egrocery.showcase
I got past this error.

Error "Cannot convert the provided notation to a File or URI" When trying to build JAR with Gradle

I am building a bot in Intellij using Gradle. I've completed the bot and try to execute the jar task in build a .jar to with all the dependancies. However, I keep running into an error.
Cannot convert the provided notation to a File or URI: [ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\net.dv8tion\JDA\4.3.0_282\c2e3739477a8e59699355db3bae73b3ab0a1c62e\JDA-4.3.0_282.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\me.duncte123\botCommons\1.0.73\bdadec013dad0b8dc6c582ddc080677978d7adcd\botCommons-1.0.73.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\com.sedmelluq\lavaplayer\1.3.64\69e1889fc5db48dafd1a22f76721d3d95a5b06be\lavaplayer-1.3.64.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-classic\1.2.3\7c4f3c474fb2c041d8028740440937705ebb473a\logback-classic-1.2.3.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\io.github.cdimascio\java-dotenv\5.1.1\6c5712d04751e707b9f925aab756302e74103f59\java-dotenv-5.1.1.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\mysql\mysql-connector-java\5.1.6\380ef5226de2c85ff3b38cbfefeea881c5fce09d\mysql-connector-java-5.1.6.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\net.sf.trove4j\trove4j\3.0.3\42ccaf4761f0dfdfa805c9e340d99a755907e2dd\trove4j-3.0.3.jar', ZIP 'C:\Users\name.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-databind\2.10.1\18eee15ffc662d27538d5b6ee84e4c92c0a9d03e\jackson-databind-2.10.1.jar', ...].
The following types/formats are supported:
- A String or CharSequence path, for example 'src/main/java' or '/usr/include'.
- A String or CharSequence URI, for example 'file:/usr/include'.
- A File instance.
- A Path instance.
- A Directory instance.
- A RegularFile instance.
- A URI or URL instance.
- A TextResource instance.
(The list of ZIPs was cut short due to there being way too many to list out.)
Below is what my build.gradle file looks like when I try to run.
plugins {
id 'java'
id 'application'
}
group 'com.darkascendants'
version '1.0-SNAPSHOT'
application {
mainClassName = 'com.darkascendants.DABot'
}
repositories {
mavenCentral()
jcenter()
maven {
name 'm2-dv8tion'
url 'https://m2.dv8tion.net/releases'
}
}
apply plugin: 'java'
dependencies {
implementation group: 'net.dv8tion', name: 'JDA', version: '4.3.0_282'
implementation group: 'me.duncte123', name: 'botCommons', version: '1.0.73'
implementation group: 'com.jagrosh', name: 'jda-utilities', version: '3.0.1'
implementation group: 'com.sedmelluq', name: 'lavaplayer', version: '1.3.64'
implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
implementation group: 'io.github.cdimascio', name: 'java-dotenv', version: '5.1.1'
implementation group: 'mysql', name: 'mysql-connector-java', version: '5.1.6'
implementation fileTree('libs') { include '*.jar' }
}
compileJava.options.encoding = 'UTF-8'
jar {
manifest {
attributes(
'Main-Class': 'com.darkascendants.DABot'
)
dependsOn configurations.runtimeClasspath
from {
configurations.runtimeClasspath.findAll { it.name.endsWith('jar') }.collect { zipTree(it) }
}
}
}
Why am I running into this issue?

Building JAR file with IntelliJ, OpenJFX and Gradle

What is in 2021 the best way to create an executable jar file with Gradle in IntelliJ using OpenJFX? Every solution I found is very complex and uses workarounds. This is my current build.gradle file
plugins {
id 'java'
id 'application'
id 'org.openjfx.javafxplugin' version '0.0.9'
}
tasks.withType(JavaCompile) {
options.encoding = "UTF-8"
}
repositories {
mavenCentral()
}
javafx {
version = "15.0.1"
modules = [ 'javafx.controls', 'javafx.fxml' ]
}
mainClassName = 'com.company.crawl.main.Main'
group 'com.company'
version '1.0-SNAPSHOT'
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.12'
compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
compile group: 'com.microsoft.sqlserver', name: 'mssql-jdbc', version: '9.2.0.jre15'
compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.11'
compile group: 'org.apache.commons', name: 'commons-csv', version: '1.8'
}
jar {
from configurations.compile.collect {zipTree it}
manifest.attributes "Main-Class": "com.company.crawl.main.Main"
}
If I run gradle :jar, the jar file includes the dependencies but not the openjfx sdk. What do I have to do to run the jar using the openjfx sdk?
UPDATE 1
changed the jar path to this:
jar {
manifest {
attributes 'Main-Class': 'com.company.crawl.main.Main'
}
from {
configurations.runtimeClasspath.collect {it.isDirectory() ? it : zipTree(it)}
}
}
after rebuilding the jar, I get the error: "JavaFX runtime components are missing". I don't know why because in the jar file the javafx folders are included. After that I added the VM options:
--module-path /path/to/javafx-sdk/lib --add-modules=javafx.controls,javafx.fxml
and the jar file runs. So what am I doing wrong?

"Cannot find or load main class net.epsilon.app.Main" Java [Gradle]

when I launch my .jar with this command "java -jar epsilon-1.0.jar"
He says "Cannot find or load main class net.epsilon.app.Main"
plugins {
id 'java'
}
group 'net.epsilon'
version '1.0'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
task fatJar(type: Jar) {
manifest {
attributes["Main-Class"] = "net.epsilon.app.Main"
}
destinationDir = file("C:/Users/EliXorZz/Desktop/EpsilonAPP")
from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
with jar
}
tasks.withType(JavaCompile) {
options.encoding = 'UTF-8'
}
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.13'
compile group: 'com.github.docker-java', name: 'docker-java', version: '3.2.0'
compile group: 'redis.clients', name: 'jedis', version: '3.3.0'
compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
compile 'me.tongfei:progressbar:0.8.1'
}
Help me please.
Thank you.
Sorry, I'm not english.

No it can't work this way.
First, you are copying all the jars to a folder called C:/Users/EliXorZz/Desktop/EpsilonAPP, but when you run your jar, you never tell java to place those jars you copied into the classpath.
So actually the command to run your jar is:
java -jar epsilon-1.0.jar -classpath 'C:/Users/EliXorZz/Desktop/EpsilonAPP/*'

Error: Could not find or load main class when i execute my jar file

I am creating a Docker image for my Java Gradle Project.
In my Docker File as I came to an understanding. Executing the dockerFile using Gradle docker creates an image for my docker file ready to be executed. it also creates a jar file for my Gradle project to be executed.
My docker File is as follows :
FROM openjdk:13-jdk-alpine
VOLUME /tmp
ARG JAR_FILE
COPY ${JAR_FILE} ./app.jar
CMD ["java","-jar","app.jar" , "Simulator.NewMain"]
and by build.gradle is as follows :
buildscript {
dependencies {
classpath group: 'de.dynamicfiles.projects.gradle.plugins', name: 'javafx-gradle-plugin', version: '8.8.2'
}
repositories {
mavenLocal()
mavenCentral()
}
}
plugins {
id 'com.palantir.docker' version '0.22.1'
id 'java'
}
allprojects {apply plugin: 'idea'}
apply plugin: 'java'
apply plugin: 'application'
mainClassName = 'Simulator.NewMain'
repositories {
mavenCentral()
mavenLocal()
jcenter()
maven { url "http://streamreasoning.org/maven" }
maven { url "http://service.hucompute.org/artifactory/libs-release" }
maven { url "https://raw.githubusercontent.com/alexeygrigorev/maven-repo/master/" }
}
docker {
name "hi"
dockerfile file('src/docker/Dockerfile')
copySpec.from(jar).rename(".*","app.jar")
buildArgs(['JAR_FILE' : "app.jar"])
}
jar {
manifest {
attributes(
'Main-Class': 'Simulator.NewMain'
)
}
from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
}
dependencies {
//compile project(':shared')
compile files('libs/mdsj.jar')
// https://mvnrepository.com/artifact/org.apache.commons/commons-math3
compile group: 'org.apache.commons', name: 'commons-math3', version: '3.0'
// https://mvnrepository.com/artifact/org.ujmp/ujmp-core
compile group: 'org.ujmp', name: 'ujmp-core', version: '0.3.0'
// https://mvnrepository.com/artifact/com.datumbox/lpsolve
compile group: 'com.datumbox', name: 'lpsolve', version: '5.5.2.0'
// https://mvnrepository.com/artifact/org.apache.commons/commons-lang3
compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.1'
// https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc
compile group: 'org.xerial', name: 'sqlite-jdbc', version: '3.7.2'
// https://mvnrepository.com/artifact/junit/junit
testCompile group: 'junit', name: 'junit', version: '4.4'
// https://mvnrepository.com/artifact/net.sourceforge/javaml
compile group: 'net.sourceforge', name: 'javaml', version: '0.1.7'
compile group: 'be.abeel', name: 'ajt', version: '2.9'
}
My Dockerfile produces a jar file into my docker image called app.jar.
I then try to run this jar file in the image. However each time I try it I stumble upon this error.
Error: Could not find or load main class NewMain.class
Caused by: java.lang.ClassNotFoundException: NewMain.class
the result of executing my Gradle docker builds successfully, however running docker run DockerImage where DockerImage is the name of my image produces the above error.
I tried to create a jar image myself from the same project and execute it using the java -cp app.jar but i am still getting the same error.
I also went through the jar file's classes and i found the class I am trying to execute.
the NewMain class is a simple println class with the following syntax:
package Simulator;
public class NewMain {
public static void main(String[] args) {
System.out.println("hi");
}
}
Does anyone know how to overcome the classnotfound error? or the reason it happens?
P.s: I suspected the reason might be from my JDK version so i updated to JDK13