Remove retrolambda and custom functional interfaces in favour of java.util.function

build.gradle

@@ -11,7 +11,6 @@ buildscript {
     }
     dependencies {
         classpath libs.android.build.gradle
-        classpath libs.gradle.retrolambda
         classpath libs.spotbugs.gradle.plugin
     }
 }
@@ -33,8 +32,6 @@ apply plugin: 'base'
 apply plugin: 'com.github.spotbugs'
 apply from: file('version.gradle')
 
-apply plugin: 'me.tatarka.retrolambda'
-
 // This is applied to all sub projects
 subprojects {
     if(!project.name.equals('jme3-android-examples')) {
@@ -245,10 +242,4 @@ if (skipPrebuildLibraries != "true" && buildNativeProjects != "true") {
 
         assemble.dependsOn extractPrebuiltNatives
     }
-}
-
-retrolambda {
-  javaVersion JavaVersion.VERSION_1_7
-  incremental true
-    jvmArgs '-noverify'
-}
+}

gradle/libs.versions.toml

@@ -13,7 +13,6 @@ android-support-appcompat = "com.android.support:appcompat-v7:28.0.0"
 androidx-annotation = "androidx.annotation:annotation:1.3.0"
 androidx-lifecycle-common = "androidx.lifecycle:lifecycle-common:2.4.0"
 gradle-git = "org.ajoberstar:gradle-git:1.2.0"
-gradle-retrolambda = "me.tatarka:gradle-retrolambda:3.7.1"
 groovy-test = "org.codehaus.groovy:groovy-test:3.0.24"
 gson = "com.google.code.gson:gson:2.13.2"
 j-ogg-vorbis = "com.github.stephengold:j-ogg-vorbis:1.0.6"

jme3-core/src/main/java/com/jme3/shader/bufferobject/layout/BufferLayout.java

@@ -36,7 +36,7 @@
 import java.util.List;
 
 import com.jme3.math.FastMath;
-import com.jme3.util.functional.Function;
+import java.util.function.Predicate;
 
 /**
  * Layout serializer for buffers
@@ -46,7 +46,7 @@
 public abstract class  BufferLayout {
 
     public static abstract class ObjectSerializer<T> {
-        private Function<Boolean, Object> filter;
+        private Predicate<Object> filter;
 
         public ObjectSerializer(Class<T> cls) {
             this(obj -> {
@@ -56,12 +56,12 @@ public ObjectSerializer(Class<T> cls) {
 
         }
 
-        public ObjectSerializer(Function<Boolean, Object> filter) {
+        public ObjectSerializer(Predicate<Object> filter) {
             this.filter = filter;
         }
 
         public final boolean canSerialize(Object obj) {
-            return filter.eval(obj);
+            return filter.test(obj);
         }
 
         public abstract int length(BufferLayout layout, T obj);