sdedic commented on a change in pull request #3405:
URL: https://github.com/apache/netbeans/pull/3405#discussion_r778092502



##########
File path: 
java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/db/DBEntityFromTables.java
##########
@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.modules.java.lsp.server.db;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import org.eclipse.lsp4j.CodeAction;
+import org.eclipse.lsp4j.CodeActionParams;
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.netbeans.api.db.explorer.ConnectionManager;
+import org.netbeans.api.db.explorer.DatabaseConnection;
+import org.netbeans.api.db.explorer.DatabaseException;
+import org.netbeans.api.java.project.JavaProjectConstants;
+import org.netbeans.api.progress.aggregate.BasicAggregateProgressFactory;
+import org.netbeans.api.progress.aggregate.ProgressContributor;
+import org.netbeans.api.project.Project;
+import org.netbeans.api.project.ProjectUtils;
+import org.netbeans.api.project.SourceGroup;
+
+import 
org.netbeans.modules.j2ee.persistence.api.entity.generator.EntitiesFromDBGenerator;
+import org.netbeans.modules.java.lsp.server.LspServerState;
+import org.netbeans.modules.java.lsp.server.protocol.CodeActionsProvider;
+import org.netbeans.modules.java.lsp.server.protocol.NbCodeLanguageClient;
+import org.netbeans.modules.java.lsp.server.protocol.QuickPickItem;
+import org.netbeans.modules.java.lsp.server.protocol.ShowInputBoxParams;
+import org.netbeans.modules.java.lsp.server.protocol.ShowQuickPickParams;
+import org.netbeans.modules.parsing.api.ResultIterator;
+import org.openide.util.Lookup;
+import org.openide.util.NbBundle;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jan Horvath
+ */
[email protected]({
+    "MSG_NoProject=No Project Open",
+    "MSG_NoDbConn=No DB Connection",
+    "MSG_NoSourceRoot=No source root found",
+    "MSG_SelectTables=Select Database Tables",
+    "MSG_EnterPackageName=Enter package name"
+})
+@ServiceProvider(service = CodeActionsProvider.class)
+public class DBEntityFromTables extends CodeActionsProvider {
+
+    private static final String COMMAND_ENTITY_FROM_TABLES = 
"db.entity.from.tables"; //NOI18N
+
+    @Override
+    public CompletableFuture<Object> processCommand(NbCodeLanguageClient 
client, String command, List<Object> arguments) {
+        if (!COMMAND_ENTITY_FROM_TABLES.equals(command)) {
+            return null;
+        }
+        
Lookup.getDefault().lookup(LspServerState.class).openedProjects().thenAccept((projects)
 -> {
+            if (projects.length > 0) {
+                createEntityClassesInProject(client, projects[0]);
+            } else {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoProject()));
+            }
+
+        });
+        return null;
+    }
+
+    private CompletableFuture 
createEntityClassesInProject(NbCodeLanguageClient client, Project prj) {
+        try {
+            DatabaseConnection connection = 
ConnectionManager.getDefault().getPreferredConnection(true);
+            if (connection == null) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoDbConn()));
+                return null;
+            }
+            ConnectionManager.getDefault().connect(connection);
+            SourceGroup[] sr = 
ProjectUtils.getSources(prj).getSourceGroups(JavaProjectConstants.SOURCES_TYPE_JAVA);
+            if (sr.length < 1) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoSourceRoot()));
+                return null;
+            }
+            Connection conn = connection.getJDBCConnection();
+            ResultSet rs = conn.getMetaData().getTables(conn.getCatalog(), 
conn.getSchema(), "%", new String[]{"TABLE", "VIEW"}); //NOI18N
+            List<QuickPickItem> dbItems = new ArrayList<>();
+            while (rs.next()) {
+                dbItems.add(new QuickPickItem(rs.getString("TABLE_NAME"))); 
//NOI18N
+            }
+            return client.showQuickPick(new 
ShowQuickPickParams(Bundle.MSG_SelectTables(), true, dbItems))
+                    .thenApply(items -> items.stream().map(item -> 
item.getLabel()).collect(Collectors.toList()))
+                    .thenAccept(tables -> {
+                        client.showInputBox(new 
ShowInputBoxParams(Bundle.MSG_EnterPackageName(), "")) //NOI18N
+                                .thenAccept(packageName -> {
+                                    EntitiesFromDBGenerator generator = new 
EntitiesFromDBGenerator(tables, true, packageName, sr[0], connection, prj, 
null);
+                                    ProgressContributor pc = 
BasicAggregateProgressFactory.createProgressContributor("entity"); //NOI18N
+                                    try {
+                                        generator.generate(pc);
+                                    } catch (SQLException | IOException ex) {
+                                        client.showMessage(new 
MessageParams(MessageType.Error, ex.getMessage()));
+                                    }
+                                });
+                        return;
+                    });
+        } catch (SQLException | IllegalArgumentException | DatabaseException 
ex) {
+            System.out.println(ex.getMessage());

Review comment:
       make this ` client.showMessage` instead, or use `NotifyDescriptor` + 
`DialogDisplayer.getDefault().notify()` that will be automagically remoted to 
the client.

##########
File path: 
java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/db/DBEntityFromTables.java
##########
@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.modules.java.lsp.server.db;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import org.eclipse.lsp4j.CodeAction;
+import org.eclipse.lsp4j.CodeActionParams;
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.netbeans.api.db.explorer.ConnectionManager;
+import org.netbeans.api.db.explorer.DatabaseConnection;
+import org.netbeans.api.db.explorer.DatabaseException;
+import org.netbeans.api.java.project.JavaProjectConstants;
+import org.netbeans.api.progress.aggregate.BasicAggregateProgressFactory;
+import org.netbeans.api.progress.aggregate.ProgressContributor;
+import org.netbeans.api.project.Project;
+import org.netbeans.api.project.ProjectUtils;
+import org.netbeans.api.project.SourceGroup;
+
+import 
org.netbeans.modules.j2ee.persistence.api.entity.generator.EntitiesFromDBGenerator;
+import org.netbeans.modules.java.lsp.server.LspServerState;
+import org.netbeans.modules.java.lsp.server.protocol.CodeActionsProvider;
+import org.netbeans.modules.java.lsp.server.protocol.NbCodeLanguageClient;
+import org.netbeans.modules.java.lsp.server.protocol.QuickPickItem;
+import org.netbeans.modules.java.lsp.server.protocol.ShowInputBoxParams;
+import org.netbeans.modules.java.lsp.server.protocol.ShowQuickPickParams;
+import org.netbeans.modules.parsing.api.ResultIterator;
+import org.openide.util.Lookup;
+import org.openide.util.NbBundle;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jan Horvath
+ */
[email protected]({
+    "MSG_NoProject=No Project Open",
+    "MSG_NoDbConn=No DB Connection",
+    "MSG_NoSourceRoot=No source root found",
+    "MSG_SelectTables=Select Database Tables",
+    "MSG_EnterPackageName=Enter package name"
+})
+@ServiceProvider(service = CodeActionsProvider.class)
+public class DBEntityFromTables extends CodeActionsProvider {
+
+    private static final String COMMAND_ENTITY_FROM_TABLES = 
"db.entity.from.tables"; //NOI18N
+
+    @Override
+    public CompletableFuture<Object> processCommand(NbCodeLanguageClient 
client, String command, List<Object> arguments) {
+        if (!COMMAND_ENTITY_FROM_TABLES.equals(command)) {
+            return null;
+        }
+        
Lookup.getDefault().lookup(LspServerState.class).openedProjects().thenAccept((projects)
 -> {
+            if (projects.length > 0) {
+                createEntityClassesInProject(client, projects[0]);

Review comment:
       Question: if the command is invoked with an active editor focused: 
shouldn't we create the classes in the editor's project instead in the 1st 
opened one ? The order of projects in `openedProjects` may be rather random.
   Of course provided that the LSP command arguments contain some URI etc to 
begin with.

##########
File path: 
java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/db/DBEntityFromTables.java
##########
@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.modules.java.lsp.server.db;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import org.eclipse.lsp4j.CodeAction;
+import org.eclipse.lsp4j.CodeActionParams;
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.netbeans.api.db.explorer.ConnectionManager;
+import org.netbeans.api.db.explorer.DatabaseConnection;
+import org.netbeans.api.db.explorer.DatabaseException;
+import org.netbeans.api.java.project.JavaProjectConstants;
+import org.netbeans.api.progress.aggregate.BasicAggregateProgressFactory;
+import org.netbeans.api.progress.aggregate.ProgressContributor;
+import org.netbeans.api.project.Project;
+import org.netbeans.api.project.ProjectUtils;
+import org.netbeans.api.project.SourceGroup;
+
+import 
org.netbeans.modules.j2ee.persistence.api.entity.generator.EntitiesFromDBGenerator;
+import org.netbeans.modules.java.lsp.server.LspServerState;
+import org.netbeans.modules.java.lsp.server.protocol.CodeActionsProvider;
+import org.netbeans.modules.java.lsp.server.protocol.NbCodeLanguageClient;
+import org.netbeans.modules.java.lsp.server.protocol.QuickPickItem;
+import org.netbeans.modules.java.lsp.server.protocol.ShowInputBoxParams;
+import org.netbeans.modules.java.lsp.server.protocol.ShowQuickPickParams;
+import org.netbeans.modules.parsing.api.ResultIterator;
+import org.openide.util.Lookup;
+import org.openide.util.NbBundle;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jan Horvath
+ */
[email protected]({
+    "MSG_NoProject=No Project Open",
+    "MSG_NoDbConn=No DB Connection",
+    "MSG_NoSourceRoot=No source root found",
+    "MSG_SelectTables=Select Database Tables",
+    "MSG_EnterPackageName=Enter package name"
+})
+@ServiceProvider(service = CodeActionsProvider.class)
+public class DBEntityFromTables extends CodeActionsProvider {
+
+    private static final String COMMAND_ENTITY_FROM_TABLES = 
"db.entity.from.tables"; //NOI18N
+
+    @Override
+    public CompletableFuture<Object> processCommand(NbCodeLanguageClient 
client, String command, List<Object> arguments) {
+        if (!COMMAND_ENTITY_FROM_TABLES.equals(command)) {
+            return null;
+        }
+        
Lookup.getDefault().lookup(LspServerState.class).openedProjects().thenAccept((projects)
 -> {
+            if (projects.length > 0) {
+                createEntityClassesInProject(client, projects[0]);
+            } else {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoProject()));
+            }
+
+        });
+        return null;
+    }
+
+    private CompletableFuture 
createEntityClassesInProject(NbCodeLanguageClient client, Project prj) {
+        try {
+            DatabaseConnection connection = 
ConnectionManager.getDefault().getPreferredConnection(true);
+            if (connection == null) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoDbConn()));
+                return null;
+            }
+            ConnectionManager.getDefault().connect(connection);
+            SourceGroup[] sr = 
ProjectUtils.getSources(prj).getSourceGroups(JavaProjectConstants.SOURCES_TYPE_JAVA);
+            if (sr.length < 1) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoSourceRoot()));
+                return null;
+            }
+            Connection conn = connection.getJDBCConnection();
+            ResultSet rs = conn.getMetaData().getTables(conn.getCatalog(), 
conn.getSchema(), "%", new String[]{"TABLE", "VIEW"}); //NOI18N
+            List<QuickPickItem> dbItems = new ArrayList<>();
+            while (rs.next()) {
+                dbItems.add(new QuickPickItem(rs.getString("TABLE_NAME"))); 
//NOI18N
+            }
+            return client.showQuickPick(new 
ShowQuickPickParams(Bundle.MSG_SelectTables(), true, dbItems))
+                    .thenApply(items -> items.stream().map(item -> 
item.getLabel()).collect(Collectors.toList()))
+                    .thenAccept(tables -> {
+                        client.showInputBox(new 
ShowInputBoxParams(Bundle.MSG_EnterPackageName(), "")) //NOI18N
+                                .thenAccept(packageName -> {
+                                    EntitiesFromDBGenerator generator = new 
EntitiesFromDBGenerator(tables, true, packageName, sr[0], connection, prj, 
null);
+                                    ProgressContributor pc = 
BasicAggregateProgressFactory.createProgressContributor("entity"); //NOI18N
+                                    try {
+                                        generator.generate(pc);

Review comment:
       Also potentially run inside LSP event loop (input box response is sent 
as a protocol response to the server). Please check and if so, run 
asynchronously. The `ProgressContributor` indicates that the code called runs 
for some time and reports progress - that won't work when LSP connection is 
blocked.
   

##########
File path: 
java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/db/DBEntityFromTables.java
##########
@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.modules.java.lsp.server.db;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import org.eclipse.lsp4j.CodeAction;
+import org.eclipse.lsp4j.CodeActionParams;
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.netbeans.api.db.explorer.ConnectionManager;
+import org.netbeans.api.db.explorer.DatabaseConnection;
+import org.netbeans.api.db.explorer.DatabaseException;
+import org.netbeans.api.java.project.JavaProjectConstants;
+import org.netbeans.api.progress.aggregate.BasicAggregateProgressFactory;
+import org.netbeans.api.progress.aggregate.ProgressContributor;
+import org.netbeans.api.project.Project;
+import org.netbeans.api.project.ProjectUtils;
+import org.netbeans.api.project.SourceGroup;
+
+import 
org.netbeans.modules.j2ee.persistence.api.entity.generator.EntitiesFromDBGenerator;
+import org.netbeans.modules.java.lsp.server.LspServerState;
+import org.netbeans.modules.java.lsp.server.protocol.CodeActionsProvider;
+import org.netbeans.modules.java.lsp.server.protocol.NbCodeLanguageClient;
+import org.netbeans.modules.java.lsp.server.protocol.QuickPickItem;
+import org.netbeans.modules.java.lsp.server.protocol.ShowInputBoxParams;
+import org.netbeans.modules.java.lsp.server.protocol.ShowQuickPickParams;
+import org.netbeans.modules.parsing.api.ResultIterator;
+import org.openide.util.Lookup;
+import org.openide.util.NbBundle;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jan Horvath
+ */
[email protected]({
+    "MSG_NoProject=No Project Open",
+    "MSG_NoDbConn=No DB Connection",
+    "MSG_NoSourceRoot=No source root found",
+    "MSG_SelectTables=Select Database Tables",
+    "MSG_EnterPackageName=Enter package name"
+})
+@ServiceProvider(service = CodeActionsProvider.class)
+public class DBEntityFromTables extends CodeActionsProvider {
+
+    private static final String COMMAND_ENTITY_FROM_TABLES = 
"db.entity.from.tables"; //NOI18N
+
+    @Override
+    public CompletableFuture<Object> processCommand(NbCodeLanguageClient 
client, String command, List<Object> arguments) {
+        if (!COMMAND_ENTITY_FROM_TABLES.equals(command)) {
+            return null;
+        }
+        
Lookup.getDefault().lookup(LspServerState.class).openedProjects().thenAccept((projects)
 -> {
+            if (projects.length > 0) {
+                createEntityClassesInProject(client, projects[0]);
+            } else {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoProject()));
+            }
+
+        });
+        return null;
+    }
+
+    private CompletableFuture 
createEntityClassesInProject(NbCodeLanguageClient client, Project prj) {
+        try {
+            DatabaseConnection connection = 
ConnectionManager.getDefault().getPreferredConnection(true);
+            if (connection == null) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoDbConn()));
+                return null;
+            }
+            ConnectionManager.getDefault().connect(connection);
+            SourceGroup[] sr = 
ProjectUtils.getSources(prj).getSourceGroups(JavaProjectConstants.SOURCES_TYPE_JAVA);
+            if (sr.length < 1) {
+                client.showMessage(new MessageParams(MessageType.Error, 
Bundle.MSG_NoSourceRoot()));
+                return null;
+            }
+            Connection conn = connection.getJDBCConnection();
+            ResultSet rs = conn.getMetaData().getTables(conn.getCatalog(), 
conn.getSchema(), "%", new String[]{"TABLE", "VIEW"}); //NOI18N

Review comment:
       This call eventually waits for the data from the JDBC connection; I'd 
suggest to run the DB query in a RequesProcessor so the LSP communication is 
not blocked. The behaviour depends on the DB location / network conditions.
   




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