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--- java:build-java [2017/09/06 09:39] – [Introduce about Gradle] admin
+++ java:build-java [2022/10/29 16:15] – external edit 127.0.0.1
@@ Line 34: / Line 34: @@
 java -jar build\jar\helloworld.jar
 </code>
 ==== compile and run with external libraries(log4j) ====
   * update code to use log4j2<code java>
@@ Line 229: / Line 230: @@
 refer:
   * http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
-  * maven search packages: http://search.maven.org/
 Maven, a Yiddish word meaning accumulator of knowledge, was originally started as an attempt to simplify the build processes in the Jakarta Turbine project
@@ Line 267: / Line 267: @@
 cd simplemaven
 mvn compile
-</code>
+</code> => maven will download all **dependency packages** to **~/.m2**
   - Step4: Run<code bat>
 java -cp target\simplemaven-1.0-SNAPSHOT.jar com.mycompany.App
@@ Line 306: / Line 306: @@
 mvn compile
 </code>
+  * maven **search** packages: http://search.maven.org/ or https://mvnrepository.com/
 ==== Set main class for packaging jar file ====
   - Step1: Add build config for pom.xml which set** main class** is **com.mycompany.Helloworld**:<code xml>
@@ Line 545: / Line 546: @@
 gradle
 </code>
-  - Step3: Click Install **Buildship Gradle Integration 2.0** or Install
+  - Step3: Click Install **Buildship Gradle Integration 2.0** or Install **Gradle IDE Pack**
+==== Add Depedency Package ====
+refer: https://docs.gradle.org/3.3/userguide/dependency_management.html
+  - Step1: Goto pages below to search maven packages:
+    * http://search.maven.org/
+    * or https://mvnrepository.com/
+  - Step2: search depedency package, for example "libgdx", we will see info of package below:<code xml>
+<dependency>
+    <groupId>com.badlogicgames.gdx</groupId>
+    <artifactId>gdx</artifactId>
+    <version>1.9.6</version>
+</dependency>
+</code>
+  - Step3: Configure depedency in **build.gradle**<code json>
+project(":core") {
+    apply plugin: "java"
+    dependencies {
+        compile "com.badlogicgames.gdx:gdx:1.9.6"
+...............................
+    }
+}
+</code>
+==== Clear Gradle caches ====
+Go to **C:\Users\anhvc\.gradle** and **delete all files** and directories in this directory
+=> Fix error run gradle when you **change java version from 1.8 to 1.7**. When you change java version, you must reload new jar packages of gradle in new version 1.7
+==== Fix error build with gradle when change default java form 1.8 to 1.7 ====
+I 've tried installing Java 8, and setting my project to use Java 8. If I change my JAVA_HOME to 1.8 on the command line and compile with gradle it works. If I try to use JAVA_HOME set to 1.7 and gradle it fails with the same error.
+<code>
+java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0
+</code>
+=> Fix: set JAVA_HOME and PATH to java8
 ===== Build Java with eclipse =====
 ==== Add jars or class build path ====
@@ Line 551: / Line 585: @@
 ==== Add required project ====
 {{:java:eclipse-project-depedency.png|}}
+===== Proguard =====
+refer: https://www.guardsquare.com/en/proguard