errors + 0.3 version bump

Author: TannerLow

build.gradle

@@ -3,20 +3,14 @@ plugins {
 }
 
 group 'com.github.TannerLow'
-version '0.2'
+version '0.3'
 description 'Matrix Library with GPU compatibility.'
 
 repositories {
     mavenCentral()
     maven { url "https://jitpack.io" }
 }
 
-//java {
-//    sourceCompatibility = JavaVersion.VERSION_16
-//    targetCompatibility = JavaVersion.VERSION_16
-//}
-
-
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'

src/main/java/com/github/TannerLow/JavaMatrixMath/GPU.java

@@ -145,7 +145,11 @@ public void initialize(boolean automaticSelection) {
         isInitialized = true;
     }
 
-    public int loadProgram(String programCode) {
+    public int loadProgram(String programCode) throws IllegalStateException {
+        if(!isInitialized) {
+            throw new IllegalStateException("GPU not yet initialized.");
+        }
+
         // Create the program from the source code
         cl_program program = clCreateProgramWithSource(context,
                 1, new String[]{ programCode }, null, null);
@@ -208,8 +212,13 @@ public void close() {
             clReleaseProgram(program);
         }
 
-        clReleaseCommandQueue(commandQueue);
-        clReleaseContext(context);
+        if(commandQueue != null) {
+            clReleaseCommandQueue(commandQueue);
+        }
+
+        if(context != null) {
+            clReleaseContext(context);
+        }
     }
 
     private static String getStringInfo(cl_platform_id platform, int paramName) {