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--- java:build-java [2017/09/08 06:26] – [Clear Gradle caches] admin
+++ java:build-java [2024/04/19 03:24] (current) – [Prepare environment variables] admin
@@ Line 4: / Line 4: @@
 d:\tools\jdk1.7.0_67\bin;D:\tools\apache-ant-1.8.4\bin;D:\tools\apache-maven-3.2.3\bin;
 </code>
-  * add new environment variable JAVA_HOME<code>
+  * add new environment variable JAVA_HOME(Change **Environment Variables in Windows**)<code>
 d:\tools\jdk1.7.0_67
 </code>
@@ 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 266: / 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 547: / Line 548: @@
   - 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/
@@ Line 568: / Line 570: @@
 }
 </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 575: / Line 585: @@
 ==== Add required project ====
 {{:java:eclipse-project-depedency.png|}}
+===== Proguard =====
+refer: https://www.guardsquare.com/en/proguard