Include the fat JAR of the LS extension

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/AvailableNodesGenerator.java

@@ -217,7 +217,7 @@ private Optional<Category> getConnection(Symbol symbol) {
     }
 
     private static List<Item> fetchConnections(ModuleID moduleId, String parentSymbol) {
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
         Optional<FunctionResult> connectorResult =
                 dbManager.getFunction(moduleId.orgName(), moduleId.packageName(), NewConnection.INIT_SYMBOL,
                         DatabaseManager.FunctionKind.CONNECTOR);

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/ConnectorGenerator.java

@@ -54,7 +54,7 @@ public JsonArray getConnectors(Map<String, String> queryMap) {
         if (CommonUtils.hasNoKeyword(queryMap, "offset")) {
             modifiedQueryMap.put("offset", "0");
         }
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
 
         List<FunctionResult> connectorResults = CommonUtils.hasNoKeyword(queryMap, "q") ?
                 dbManager.getAllFunctions(DatabaseManager.FunctionKind.CONNECTOR) :

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/FunctionGenerator.java

@@ -126,7 +126,7 @@ private void buildProjectNodes(Map<String, String> queryMap, LineRange position)
 
     private void buildUtilityNodes(Map<String, String> queryMap) {
         Category.Builder utilityBuilder = rootBuilder.stepIn(Category.Name.UTILITIES);
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
 
         List<FunctionResult> functionResults = CommonUtils.hasNoKeyword(queryMap, "q") ?
                 dbManager.getAllFunctions(DatabaseManager.FunctionKind.FUNCTION) :

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/db/DatabaseManager.java

@@ -22,7 +22,10 @@
 import io.ballerina.flowmodelgenerator.core.db.model.FunctionResult;
 import io.ballerina.flowmodelgenerator.core.db.model.ParameterResult;
 
+import java.io.IOException;
 import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
@@ -45,12 +48,41 @@ public class DatabaseManager {
     private static final Logger LOGGER = Logger.getLogger(DatabaseManager.class.getName());
     private final String dbPath;
 
+    private static class Holder {
+
+        private static final DatabaseManager INSTANCE = new DatabaseManager();
+    }
+
+    public static DatabaseManager getInstance() {
+        return Holder.INSTANCE;
+    }
+
     public DatabaseManager() {
+        try {
+            Class.forName("org.sqlite.JDBC");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Failed to load SQLite JDBC driver", e);
+        }
+
+        Path tempDir;
+        try {
+            tempDir = Files.createTempDirectory("central-index");
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to create a temporary directory", e);
+        }
+
         URL dbUrl = getClass().getClassLoader().getResource(INDEX_FILE_NAME);
         if (dbUrl == null) {
             throw new RuntimeException("Database resource not found: " + INDEX_FILE_NAME);
         }
-        dbPath = "jdbc:sqlite:" + dbUrl.getPath();
+        Path tempFile = tempDir.resolve(INDEX_FILE_NAME);
+        try {
+            Files.copy(dbUrl.openStream(), tempFile);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to copy the database file to the temporary directory", e);
+        }
+
+        dbPath = "jdbc:sqlite:" + tempFile.toString();
     }
 
     public enum FunctionKind {

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/model/node/ActionCall.java

@@ -94,7 +94,7 @@ private static FlowNode fetchNodeTemplate(NodeBuilder nodeBuilder, Codedata code
             return null;
         }
 
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
         Optional<FunctionResult> functionResult = codedata.id() != null ? dbManager.getFunction(codedata.id()) :
                 dbManager.getAction(codedata.org(), codedata.module(), codedata.symbol());
         if (functionResult.isEmpty()) {

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/model/node/FunctionCall.java

@@ -110,7 +110,7 @@ public void setConcreteTemplateData(TemplateContext context) {
             return;
         }
 
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
         Optional<FunctionResult> functionResult =
                 dbManager.getFunction(codedata.org(), codedata.module(), codedata.symbol(),
                         DatabaseManager.FunctionKind.FUNCTION);
@@ -184,7 +184,7 @@ public Map<Path, List<TextEdit>> toSource(SourceBuilder sourceBuilder) {
     }
 
     private static FlowNode fetchNodeTemplate(NodeBuilder nodeBuilder, Codedata codedata) {
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
         Optional<FunctionResult> functionResult =
                 dbManager.getFunction(codedata.org(), codedata.module(), codedata.symbol(),
                         DatabaseManager.FunctionKind.FUNCTION);

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/model/node/NewConnection.java

@@ -92,7 +92,7 @@ public Map<Path, List<TextEdit>> toSource(SourceBuilder sourceBuilder) {
     }
 
     private static FlowNode fetchNodeTemplate(NodeBuilder nodeBuilder, Codedata codedata) {
-        DatabaseManager dbManager = new DatabaseManager();
+        DatabaseManager dbManager = DatabaseManager.getInstance();
         Optional<FunctionResult> functionResult = codedata.id() != null ? dbManager.getFunction(codedata.id()) :
                 dbManager.getFunction(codedata.org(), codedata.module(), codedata.symbol(),
                         DatabaseManager.FunctionKind.CONNECTOR);

flow-model-generator/modules/flow-model-generator-core/src/main/java/module-info.java

@@ -31,6 +31,7 @@
     requires io.ballerina.openapi.core;
     requires io.swagger.v3.oas.models;
     requires jakarta.persistence;
+    requires org.xerial.sqlitejdbc;
 
     exports io.ballerina.flowmodelgenerator.core;
 }

flow-model-generator/modules/flow-model-generator-ls-extension/build.gradle

@@ -115,6 +115,20 @@ def pullBallerinaModule(String packageName) {
     }
 }
 
+// TODO: This should be removed once https://github.com/ballerina-platform/ballerina-distribution/issues/5811 is completed
+shadowJar {
+    archiveBaseName.set(project.name)
+    archiveClassifier.set('')
+    archiveVersion.set(project.version.toString())
+    configurations = [project.configurations.runtimeClasspath]
+    dependencies {
+        include(dependency("org.xerial:sqlite-jdbc:${sqliteJdbcVersion}"))
+        exclude('META-INF/*.SF')
+        exclude('META-INF/*.DSA')
+        exclude('META-INF/*.RSA')
+    }
+}
+
 test.dependsOn pullBallerinaModule('ballerinax/redis')
 test.dependsOn pullBallerinaModule('ballerinax/trigger.salesforce')
 
@@ -130,7 +144,6 @@ test {
 }
 
 ext.moduleName = 'io.ballerina.flowmodelgenerator.extension'
-
 jar {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
     dependsOn configurations.dist
@@ -147,3 +160,7 @@ compileJava {
         classpath = files()
     }
 }
+
+artifacts {
+    archives shadowJar
+}