Add throwJavaException

bindings/java/src/main/java/org/github/tursodatabase/NativeInvocation.java

@@ -9,7 +9,7 @@ import java.lang.annotation.Target;
 /**
  * Annotation to mark methods that are called by native functions.
  */
-@Retention(RetentionPolicy.RUNTIME)
+@Retention(RetentionPolicy.SOURCE)
 @Target(ElementType.METHOD)
 public @interface NativeInvocation {
 }

bindings/java/src/main/java/org/github/tursodatabase/VisibleForTesting.java

@@ -0,0 +1,14 @@
+package org.github.tursodatabase;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to mark methods that use larger visibility for testing purposes.
+ */
+@Retention(RetentionPolicy.SOURCE)
+@Target(ElementType.METHOD)
+public @interface VisibleForTesting {
+}

bindings/java/src/main/java/org/github/tursodatabase/core/LimboDB.java

@@ -3,6 +3,7 @@ package org.github.tursodatabase.core;
 
 import org.github.tursodatabase.LimboErrorCode;
 import org.github.tursodatabase.NativeInvocation;
+import org.github.tursodatabase.VisibleForTesting;
 import org.github.tursodatabase.exceptions.LimboException;
 
 import java.nio.charset.StandardCharsets;
@@ -104,6 +105,9 @@ public final class LimboDB extends AbstractDB {
     @Override
     public synchronized native int step(long stmt);
 
+    @VisibleForTesting
+    native void throwJavaException(int errorCode) throws SQLException;
+
     /**
      * Throws formatted SQLException with error code and message.
      *

bindings/java/src/test/java/org/github/tursodatabase/core/LimboDBTest.java

@@ -1,10 +1,13 @@
 package org.github.tursodatabase.core;
 
+import org.github.tursodatabase.LimboErrorCode;
 import org.github.tursodatabase.TestUtils;
+import org.github.tursodatabase.exceptions.LimboException;
 import org.junit.jupiter.api.Test;
 
 import java.sql.SQLException;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 public class LimboDBTest {
@@ -26,4 +29,20 @@ public class LimboDBTest {
 
         assertThatThrownBy(() -> db.open(0)).isInstanceOf(SQLException.class);
     }
+
+    @Test
+    void throwJavaException_should_throw_appropriate_java_exception() throws Exception {
+        String dbPath = TestUtils.createTempFile();
+        LimboDB db = LimboDB.create("jdbc:sqlite:" + dbPath, dbPath);
+        db.load();
+
+        final int limboExceptionCode = LimboErrorCode.ETC.code;
+        try {
+            db.throwJavaException(limboExceptionCode);
+        } catch (Exception e)  {
+            assertThat(e).isInstanceOf(LimboException.class);
+            LimboException limboException = (LimboException) e;
+            assertThat(limboException.getResultCode().code).isEqualTo(limboExceptionCode);
+        }
+    }
 }