JNI: implement AutoCloseable for the sqlite3 and sqlite3_stmt classes, and adjust a few tests to use it. Override Object.finalize() for sqlite3 class but not sqlite3_stmt (where it triggers a JVM crash for as-yet-unknown reasons).

FossilOrigin-Name: b633d8bbdbd43464ee03058c273e5188117b9538ed5d5148a1a3851e4adf6410

ext/jni/src/org/sqlite/jni/Tester1.java

@@ -404,7 +404,7 @@ public class Tester1 implements Runnable {
   }
 
   private void testBindFetchInt64(){
-    sqlite3 db = createNewDb();
+    try (sqlite3 db = createNewDb()){
       execSql(db, "CREATE TABLE t(a)");
       sqlite3_stmt stmt = prepare(db, "INSERT INTO t(a) VALUES(?);");
       long total1 = 0;
@@ -422,11 +422,12 @@ public class Tester1 implements Runnable {
       }
       sqlite3_finalize(stmt);
       affirm(total1 == total2);
-    sqlite3_close_v2(db);
+      //sqlite3_close_v2(db);
+    }
   }
 
   private void testBindFetchDouble(){
-    sqlite3 db = createNewDb();
+    try (sqlite3 db = createNewDb()){
       execSql(db, "CREATE TABLE t(a)");
       sqlite3_stmt stmt = prepare(db, "INSERT INTO t(a) VALUES(?);");
       double total1 = 0;
@@ -447,7 +448,8 @@ public class Tester1 implements Runnable {
       affirm(4 == counter);
       sqlite3_finalize(stmt);
       affirm(total2<=total1+0.01 && total2>=total1-0.01);
-    sqlite3_close_v2(db);
+      //sqlite3_close_v2(db);
+    }
   }
 
   private void testBindFetchText(){
@@ -491,20 +493,25 @@ public class Tester1 implements Runnable {
     affirm(3 == n);
     affirm("w😃rldhell🤩!🤩".equals(sbuf.toString()));
 
-    stmt = prepare(db, "SELECT ?, ?");
-    rc = sqlite3_bind_text(stmt, 1, "");
+    try( sqlite3_stmt stmt2 = prepare(db, "SELECT ?, ?") ){
+      rc = sqlite3_bind_text(stmt2, 1, "");
       affirm( 0==rc );
-    rc = sqlite3_bind_text(stmt, 2, (String)null);
+      rc = sqlite3_bind_text(stmt2, 2, (String)null);
       affirm( 0==rc );
-    rc = sqlite3_step(stmt);
+      rc = sqlite3_step(stmt2);
       affirm( SQLITE_ROW==rc );
-    byte[] colBa = sqlite3_column_text(stmt, 0);
+      byte[] colBa = sqlite3_column_text(stmt2, 0);
       affirm( 0==colBa.length );
-    colBa = sqlite3_column_text(stmt, 1);
+      colBa = sqlite3_column_text(stmt2, 1);
       affirm( null==colBa );
-    sqlite3_finalize(stmt);
+      //sqlite3_finalize(stmt);
+    }
 
+    if(true){
       sqlite3_close_v2(db);
+    }else{
+      // Let the Object.finalize() override deal with it.
+    }
   }
 
   private void testBindFetchBlob(){

ext/jni/src/org/sqlite/jni/sqlite3.java

@@ -19,19 +19,30 @@ package org.sqlite.jni;
    simply provide a type-safe way to communicate it between Java
    and C via JNI.
 */
-public final class sqlite3 extends NativePointerHolder<sqlite3> {
+public final class sqlite3 extends NativePointerHolder<sqlite3>
+ implements AutoCloseable {
+
   // Only invoked from JNI
   private sqlite3(){}
 
   public String toString(){
-    long ptr = getNativePointer();
+    final long ptr = getNativePointer();
     if( 0==ptr ){
       return sqlite3.class.getSimpleName()+"@null";
     }
-    String fn = SQLite3Jni.sqlite3_db_filename(this, "main");
+    final String fn = SQLite3Jni.sqlite3_db_filename(this, "main");
     return sqlite3.class.getSimpleName()
       +"@"+String.format("0x%08x",ptr)
       +"["+((null == fn) ? "<unnamed>" : fn)+"]"
       ;
   }
+
+  @Override protected void finalize(){
+    //System.out.println(this+".finalize()");
+    SQLite3Jni.sqlite3_close_v2(this);
+  }
+
+  @Override public void close(){
+    SQLite3Jni.sqlite3_close_v2(this);
+  }
 }

ext/jni/src/org/sqlite/jni/sqlite3_stmt.java

@@ -19,7 +19,17 @@ package org.sqlite.jni;
    simply provide a type-safe way to communicate it between Java and C
    via JNI.
 */
-public final class sqlite3_stmt extends NativePointerHolder<sqlite3_stmt> {
+public final class sqlite3_stmt extends NativePointerHolder<sqlite3_stmt>
+  implements AutoCloseable {
   // Only invoked from JNI.
   private sqlite3_stmt(){}
+
+  //For as-yet-unknown reasons, this triggers a JVM crash.
+  //@Override protected void finalize(){
+  //  SQLite3Jni.sqlite3_finalize(this);
+  //}
+
+  @Override public void close(){
+    SQLite3Jni.sqlite3_finalize(this);
+  }
 }

manifest

@@ -1,5 +1,5 @@
-C Fix\syet\sanother\sassert()\sin\sthe\spartial-index\sconstant\svalue\soptimization.
-D 2023-09-26T19:38:24.673
+C JNI:\simplement\sAutoCloseable\sfor\sthe\ssqlite3\sand\ssqlite3_stmt\sclasses,\sand\sadjust\sa\sfew\stests\sto\suse\sit.\sOverride\sObject.finalize()\sfor\ssqlite3\sclass\sbut\snot\ssqlite3_stmt\s(where\sit\striggers\sa\sJVM\scrash\sfor\sas-yet-unknown\sreasons).
+D 2023-09-26T19:49:35.180
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -262,7 +262,7 @@ F ext/jni/src/org/sqlite/jni/SQLFunction.java 544a875d33fd160467d82e2397ac33157b
 F ext/jni/src/org/sqlite/jni/SQLite3Jni.java 73571d69420a72fa656097925acfbc3f670bb72685882094565303dcdfed71b5
 F ext/jni/src/org/sqlite/jni/ScalarFunction.java 6d387bb499fbe3bc13c53315335233dbf6a0c711e8fa7c521683219b041c614c
 F ext/jni/src/org/sqlite/jni/TableColumnMetadata.java 54511b4297fa28dcb3f49b24035e34ced10e3fd44fd0e458e784f4d6b0096dab
-F ext/jni/src/org/sqlite/jni/Tester1.java 30627199744e2c80b03d8d2ac439b2270a7050bedaa6d4b293cd08a2817741f4
+F ext/jni/src/org/sqlite/jni/Tester1.java 25be176398cf08cb9c0879ba33fd866cb8f579729dd4d44a4065421e1b899af4
 F ext/jni/src/org/sqlite/jni/TraceV2Callback.java beb0b064c1a5f8bfe585a324ed39a4e33edbe379a3fc60f1401661620d3ca7c0
 F ext/jni/src/org/sqlite/jni/UpdateHookCallback.java 8376f4a931f2d5612b295c003c9515ba933ee76d8f95610e89c339727376e36c
 F ext/jni/src/org/sqlite/jni/WindowFunction.java 488980f4dbb6bdd7067d6cb9c43e4075475e51c54d9b74a5834422654b126246
@@ -282,11 +282,11 @@ F ext/jni/src/org/sqlite/jni/fts5/fts5_api.java e2ad9bc06a9d307e0a6221c116457838
 F ext/jni/src/org/sqlite/jni/fts5/fts5_extension_function.java 1fe0f5692c1d67475d12b067f0469949073446f18c56eba5ee5da6ddd06db9b9
 F ext/jni/src/org/sqlite/jni/fts5/fts5_tokenizer.java ea993738b851038c16d98576abd0db3d6028a231f075a394fb8a78c7834d0f6c
 F ext/jni/src/org/sqlite/jni/package-info.java a3946db2504de747a1993c4f6e8ce604bec5a8e5a134b292c3b07527bc321a99
-F ext/jni/src/org/sqlite/jni/sqlite3.java 62b1b81935ccf3393472d17cb883dc5ff39c388ec3bc1de547f098a0217158fc
+F ext/jni/src/org/sqlite/jni/sqlite3.java 5e56a799ced58ea69e8bcad20c29a61fce32f21a7f4fb3e2702337cf8aa1a06e
 F ext/jni/src/org/sqlite/jni/sqlite3_backup.java d0bb06dd6225e76999ff6b7ab20f2643b1c4d4167431b3a93ea41943e41f094b
 F ext/jni/src/org/sqlite/jni/sqlite3_blob.java f28a30134f2e524eb7d5ab87f57f86c90140341a6e8369ee54509ac8bb96fa82
 F ext/jni/src/org/sqlite/jni/sqlite3_context.java 66ca95ce904044263a4aff684abe262d56f73e6b06bca6cf650761d79d7779ad
-F ext/jni/src/org/sqlite/jni/sqlite3_stmt.java 78e6d1b95ac600a9475e9db4623f69449322b0c93d1bd4e1616e76ed547ed9fc
+F ext/jni/src/org/sqlite/jni/sqlite3_stmt.java 36ecee9bdde2e70c7276d1c22b48fd9c40a77412e8e0694e9c09910997d6fb4f
 F ext/jni/src/org/sqlite/jni/sqlite3_value.java 3d1d4903e267bc0bc81d57d21f5e85978eff389a1a6ed46726dbe75f85e6914a
 F ext/jni/src/org/sqlite/jni/tester/SQLTester.java 9892797db57c6e01f0c1601b5866474b6c046f0fd6c5b64f411e5815c941040e
 F ext/jni/src/org/sqlite/jni/tester/test-script-interpreter.md f9f25126127045d051e918fe59004a1485311c50a13edbf18c79a6ff9160030e
@@ -2122,8 +2122,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 63aea8c3e0605edcf49ad1e5ce1a56d2690dcb8c4857043997545daab46ca035
-R dde20269cd95793e2cf58d6b66b4965e
-U drh
-Z 9624e2e51b9eb60e25af33993d2976c5
+P f459d0806cf044fd07743e4c91d0a5a6ddf45b3b41004bde4278f190d99a4cf5
+R 7e350d02408f55cc22e8200c238dad8b
+U stephan
+Z 5d6f98871a0b5c1c9a053c0258a32258
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-f459d0806cf044fd07743e4c91d0a5a6ddf45b3b41004bde4278f190d99a4cf5
+b633d8bbdbd43464ee03058c273e5188117b9538ed5d5148a1a3851e4adf6410