Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:langage_groovy [2025/11/11 20:46] – Jean-Baptiste
+++ tech:langage_groovy [2026/06/07 19:12] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Java Langage CA}}
+# Langage Groovy
+Voir aussi :
+ * https://developers.redhat.com/articles/2023/07/06/how-use-debezium-smt-groovy-filter-routing-events
+## Hello world
+~~~groovy
+#! /usr/bin/env groovy
+/*
+This is an example
+*/
+println "Hello World !"
+~~~
+## Importer une class
+~~~groovy
+/*
+#from java.util import Date
+#from java.text import SimpleDateFormat
+*/
+import java.util.Date
+import java.text.SimpleDateFormat
+~~~
+## Fichier java .class
+`test.groovy`
+~~~groovy
+#! /usr/bin/env groovy
+println "Test1"
+class echo1 {
+        def name;
+        String hello() {
+                println "Test2"
+                return name
+        }
+}
+~~~
+~~~bash
+groovyc test.groovy
+~~~
+~~~
+$ strings test.class | grep -i test
+test
+test.groovy
+Ltest;
+Test1
+$ file *.class
+echo1.class: compiled Java class data, version 49.0 (Java 1.5)
+test.class:  compiled Java class data, version 49.0 (Java 1.5)
+~~~
+~~~
+$ groovy --classpath=. test
+Test1
+$ groovy --classpath=. test.groovy
+Test1
+~~~
+## Pb
+### Pb WARNING: An illegal reflective access operation has occurred
+~~~
+WARNING: An illegal reflective access operation has occurred
+WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/usr/share/groovy/lib/groovy-2.4.21.jar) to method java.lang.Object.finalize()
+WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
+WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
+WARNING: All illegal access operations will be denied in a future release
+~~~
+### Pb Error: Could not find or load main class test
+~~~
+$ java -cp . test
+Error: Could not find or load main class test
+Caused by: java.lang.NoClassDefFoundError: groovy/lang/Script
+~~~
+#### Solution
+~~~bash
+java -cp /usr/share/groovy/lib/groovy-2.4.21.jar:$PWD test
+~~~
+### Pb Error: Main method not found in class xxx
+~~~bash
+$ java -cp /usr/share/groovy/lib/groovy-2.4.21.jar:$PWD echo1
+Error: Main method not found in class echo1, please define the main method as:
+   public static void main(String[] args)
+or a JavaFX application class must extend javafx.application.Application
+~~~
+#### Solution
+Voir : https://www.yawintutor.com/main-method-not-found-javafx-application-class/
+`test.groovy`
+~~~groovy
+#! /usr/bin/env groovy
+package com.plop;
+public class Hello {
+        public static void main(String[] args) {
+                System.out.println("Hello World");
+        }
+}
+~~~
+~~~bash
+java -cp /usr/share/groovy/lib/groovy-2.4.21.jar:$PWD com/plop/Hello
+~~~