I have an Android Studio project with a pure Java 8 library module. Here is the complete gradle.build file for that library:
apply plugin: 'java-library'
dependencies {
testImplementation 'junit:junit:4.12'
}
sourceCompatibility = "1.8"
targetCompatibility = "1.8"
The code is tested and works fine.
The problem I am having is that I have built the project, and then tried to use the built .jar file in another Android project that doesn't uses Java 7 (not 8). Obviously, the code does not work. However, I am surprised that there are no compile-time errors indicating that the library is not compatible. Instead, I only first notice the incompatibility when a runtime function is called.
Am I doing something wrong in how I am compiling the Java module? Or is it expected behavior that you will only get runtime errors that the library is not compatible? I expected compile-time errors.
Also, please tell me how to compile properly so that I can get compile-time errors in Android Studio indicating that a library was compiled with a newer Java version.
For completeness, I am getting the following runtime error when I use my Java 8 library module
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/util/Base64;
java.util.Base64 added in API level 26 ( https://developer.android.com/reference/java/util/Base64.html ). You must use android.util.Base64 ( https://developer.android.com/reference/android/util/Base64 .)
For universal library I use Google Guava .
<dependency>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
<type>jar</type>
<version>14.0.1</version>
</dependency>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.