B4J Question MSSQL DRIVER Issue

Peter Lewis · Dec 16, 2025

Hi, I have the following additional jar

B4X:

#AdditionalJar:mssql-jdbc-12.8.2.jre11
#AdditionalJar: HikariCP-5.0.1

then I am using Java jdk-19.0.2
To init the pool we are using

B4X:

Public pool As HikariCP
pool.Initialize("com.microsoft.sqlserver.jdbc.SQLServerDriver",$"jdbc:sqlserver://${host}:${port};databaseName=${database}"$,user,password)

with the following code starting sql

B4X:

Dim sql As SQL = pool.GetConnection

The error code I am getting is as follows

java.lang.RuntimeException: Failed to get driver instance for jdbcUrl=com.microsoft.sqlserver.jdbc.SQLServerDriver

The .jar file is in the additional files folder and I cannot see what I have done wrong.

Thank you

besoft · Dec 17, 2025

Try this:

string:

pool.Initialize("com.microsoft.sqlserver.jdbc.SQLServerDriver", _
    $"jdbc:sqlserver://$host$:$port$;databaseName=$database$;encrypt=true;trustServerCertificate=true"$, _
    user, password)

Newer mssql-jdbc drivers have encryption enabled by default, and if the certificate is not trusted, the connection fails (sometimes it shows as "Failed to get driver instance..." or as an SSL error, depending on where the exception is caught).

Peter Lewis · Dec 17, 2025

besoft said:
Try this:

string:

pool.Initialize("com.microsoft.sqlserver.jdbc.SQLServerDriver", _ $"jdbc:sqlserver://$host$:$port$;databaseName=$database$;encrypt=true;trustServerCertificate=true"$, _ user, password)

Newer mssql-jdbc drivers have encryption enabled by default, and if the certificate is not trusted, the connection fails (sometimes it shows as "Failed to get driver instance..." or as an SSL error, depending on where the exception is caught).

I tried it with the same error code. Thank you for trying

java.lang.RuntimeException: Failed to get driver instance for jdbcUrl=com.microsoft.sqlserver.jdbc.SQLServerDriver

aeric · Dec 17, 2025

Peter Lewis said:
I am using Java jdk-19.0.2

Maybe mssql-jdbc-12.8 is not supported for JDK 19. Try JDK 11 or JDK 17.

Release Notes - JDBC Driver for SQL Server

This article lists the releases of the Microsoft JDBC Driver for SQL Server. For each release version, the changes are named and described.

learn.microsoft.com

besoft · Dec 17, 2025

Try without port. My connection string:

string2:

sqlMS.Initialize("com.microsoft.sqlserver.jdbc.SQLServerDriver","jdbc:sqlserver://XXX\MSSQLSERVER;databaseName=dbname;user=user;password=password;encrypt=true;trustServerCertificate=true")

Pay attention to how the server name is written. If the server is on a local network and whether the server is accessible via the web.

Jmu5667 · Dec 17, 2025

This is what I do using java 19 (v: is a network drive where is drive is located)

B4X:

#AdditionalJar: V:\jdbc\sqljdbc_13.2\enu\jars\mssql-jdbc-13.2.1.jre11.jar

B4X:

       u = username
       p = password
       sqlHost = '//yourdomain.com:port'
       driveClass = $"com.microsoft.sqlserver.jdbc.SQLServerDriver"$
        jdbcUrl = $"jdbc:sqlserver:${sqlHost};encrypt=false;trustServerCertificate=false;loginTimeout=10"$
        dbSQL.Initialize(driveClass,jdbcUrl, u, p)

Hope this helps

John

Peter Lewis · Dec 17, 2025

I have tried all the options suggested.

I then made my mqtt server address blank and i do not get an error on the MSSQL

Waiting for debugger to connect...
Program started.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Adding credentials
Adding Connection Test Query
mssql 192.168.3.254
Emulated network latency: 100ms
mqtt (No IP address)
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.eclipse.paho.client.mqttv3.internal.NetworkModuleService (file:/C:/Program%20Files/Anywhere%20Software/B4J/Libraries/jMQTT.jar) to field java.net.URI.userInfo
WARNING: Please consider reporting this to the maintainers of org.eclipse.paho.client.mqttv3.internal.NetworkModuleService
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Error connecting MQTT.
Error connecting MQTT.

The minute I put MQTT back

Waiting for debugger to connect...
Program started.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Adding credentials
Adding Connection Test Query
mssql192.168.3.254
Emulated network latency: 100ms
mqtt 192.168.3.254
connected
$SYS/broker/clients/active
java.lang.RuntimeException: Failed to get driver instance for jdbcUrl=com.microsoft.sqlserver.jdbc.SQLServerDriver
Clients Active 0
$SYS/broker/clients/active
java.lang.RuntimeException: Failed to get driver instance for jdbcUrl=com.microsoft.sqlserver.jdbc.SQLServerDriver
Clients Active 1

The Port for MSSQL is 1433 and MQTT is 1883

aminoacid · Dec 17, 2025

Looks like your MQTT broker and MSSQL Server are running on the same computer. Use this to connect to the MQTT server and set "working=true" only after the connection to the MSSQL server has been established:

[B4X] MQTT - Connect & Reconnect

The ConnectAndReconnect sub takes care of connecting to the broker and reconnecting if the connection has broken. It sends a "ping" request every 5 seconds to help the MQTT client recognize network failures. It is a nice example of how Wait For and Sleep can help to manage the network state...

www.b4x.com

Peter Lewis · Dec 18, 2025

aminoacid said:
Looks like your MQTT broker and MSSQL Server are running on the same computer. Use this to connect to the MQTT server and set "working=true" only after the connection to the MSSQL server has been established:

[B4X] MQTT - Connect & Reconnect

The ConnectAndReconnect sub takes care of connecting to the broker and reconnecting if the connection has broken. It sends a "ping" request every 5 seconds to help the MQTT client recognize network failures. It is a nice example of how Wait For and Sleep can help to manage the network state...

www.b4x.com

Tried that and also tried a public MQTT server with still ther same issue

aeric · Dec 18, 2025

Create a small project to test. Don't add MQTT.
If you want a quick test, try my jRDC2 Server template. Edit the config.properties file and test run it.

I have tested with JDK 19.0.2 and mssql-jdbc-12.8.2.jre11

config.properties:

## MS SQL Server configuration:
MSSQL.DriverClass=com.microsoft.sqlserver.jdbc.SQLServerDriver
MSSQL.JdbcUrl=jdbc:sqlserver://localhost:1433;databaseName={DBName};encrypt=false;trustServerCertificate=true
MSSQL.DBName=test
MSSQL.User=sa
MSSQL.Password=password

aeric · Dec 18, 2025

Peter Lewis said:
MQTT is 1883

Can you try with other port eg 51041 ?

Peter Lewis · Dec 18, 2025

aeric said:
Create a small project to test. Don't add MQTT.
If you want a quick test, try my jRDC2 Server template. Edit the config.properties file and test run it.

I have tested with JDK 19.0.2 and mssql-jdbc-12.8.2.jre11

config.properties:

## MS SQL Server configuration: MSSQL.DriverClass=com.microsoft.sqlserver.jdbc.SQLServerDriver MSSQL.JdbcUrl=jdbc:sqlserver://localhost:1433;databaseName={DBName};encrypt=false;trustServerCertificate=true MSSQL.DBName=test MSSQL.User=sa MSSQL.Password=password

Thank you for the information.

I have never used a project template before. It is not seen in File > Open , or add existing Modules . I even renamed the extension to n4j and no luck

Please point me in the right direction.

Thank you

aeric · Dec 18, 2025

Peter Lewis said:
I have never used a project template before

Project template is similar to b4xlib. Don't rename the extension.
Just drop the file into B4J additional libraries folder. Refresh the libraries tab (Right Click, Refresh) or restart B4J.

aeric · Dec 18, 2025

Peter Lewis said:
also tried a public MQTT server with still ther same issue

Are you creating a B4J UI or non-UI app?
Is this a MQTT broker or client?
Can you list the libraries you are using?

Peter Lewis · Dec 18, 2025

aeric said:
Are you creating a B4J UI or non-UI app?
Is this a MQTT broker or client?
Can you list the libraries you are using?

I am trying to make a simple app to test , The end product will have to be a non-ui

I cannot find the template here after I put the file in the additional libs folder and restarted b4j.

Cannot find the config.properties area.

I have not used b4j for over 1 year so please bear with me.

aeric · Dec 18, 2025

The template should be appeared when you click on the menu File -> New, if you put the file in the correct directory.

Peter Lewis said:
Cannot find the config.properties area.

Once you have created a new project, you can find it inside the project's Files folder.

After you have edited the config.properties, save the file.
Open B4J IDE, click on the compilation dropdown select from "Default" change to "MSSQL". The dropdown is next to "Debug" dropdown.

Peter Lewis · Dec 18, 2025

aeric said:
The template should be appeared when you click on the menu File -> New, if you put the file in the correct directory.

Once you have created a new project, you can find it inside the project's Files folder.

After you have edited the config.properties, save the file.
Open B4J IDE, click on the compilation dropdown select from "Default" change to "MSSQL". The dropdown is next to "Debug" dropdown.

Hi

Went through that and a webpage opened.

This is the log window

Waiting for debugger to connect...
Program started.
Checking database...
Database found!
2025-12-18 12:14:37.239:INFO :cmvl.MLog:MLog-Init-Reporter: MLog clients using slf4j logging.
2025-12-18 12:14:37.339:INFO :cmvc.C3P0Registry:main: Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]
Starting server...
2025-12-18 12:14:37.417:INFO ejs.Server:main: jetty-11.0.9; built: 2022-03-30T17:44:47.085Z; git: 243a48a658a183130a8c8de353178d154ca04f04; jvm 11.0.1+13
2025-12-18 12:14:37.462:INFO ejss.DefaultSessionIdManager:main: Session workerName=node0
2025-12-18 12:14:37.471:INFO ejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@669513d8{/,file:///C:/SOURCE~2/testmss/Objects/www,AVAILABLE}
2025-12-18 12:14:37.475:INFO ejs.RequestLogWriter:main: Opened C:\source code\testmss\Objects\logs\b4j-2025_12_18.request.log
2025-12-18 12:14:37.484:INFO ejs.AbstractConnector:main: Started ServerConnector@14dda234{HTTP/1.1, (http/1.1)}{0.0.0.0:17178}
2025-12-18 12:14:37.487:INFO ejs.Server:main: Started Server@58ebfd03{STARTING}[11.0.9,sto=0] @1582ms
Emulated network latency: 100ms
jRDC2 is running (template version = 3.30)
2025-12-18 12:14:37.693:INFO :cmvci.AbstractPoolBackedDataSource:main: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 20000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> 1hge1oebfdkzpi6bjsqqj|40317ba2, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.microsoft.sqlserver.jdbc.SQLServerDriver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> 1hge1oebfdkzpi6bjsqqj|40317ba2, idleConnectionTestPeriod -> 600, initialPoolSize -> 3, jdbcUrl -> jdbc:sqlserver://localhost:1433;databaseName=dna;encrypt=false;trustServerCertificate=true, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 1800, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 150, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {password=******, user=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> true, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]

aeric · Dec 18, 2025

So it is working.
I am not sure about HikariCP.

Peter Lewis · Dec 18, 2025

aeric said:
So it is working.
I am not sure about HikariCP.

It does work. I added the MQTT to the test program and it also works.

Going to add HikariCP now and check

Thank you

Peter Lewis · Dec 18, 2025

aeric said:
So it is working.
I am not sure about HikariCP.

Just as a matter of Interest, I decided to run the Server App on a remote PC connecting to my Server which runs MQTT and MSSQL and it is running perfectly with no change of code from 2 years ago. They always used to run on the same server. Nothing on the code has changed. The only item that changed is the Version of B4J.

host 192.168.3.254
2025-12-18 15:19:37.220:INFO ejs.Server:main: jetty-11.0.9; built: 2022-03-30T17:44:47.085Z; git: 243a48a658a183130a8c8de353178d154ca04f04; jvm 11.0.1+13
2025-12-18 15:19:37.328:INFO ejss.DefaultSessionIdManager:main: Session workerName=node0
2025-12-18 15:19:37.353:INFO ejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@22ef9844{/,file:///C:/Users/peter/OneDrive/Documents/GitHub/DNA/dnaserver/Objects/www/,AVAILABLE}
2025-12-18 15:19:37.360:INFO ejs.RequestLogWriter:main: Opened C:\Users\peter\OneDrive\Documents\GitHub\DNA\dnaserver\Objects\logs\b4j-2025_12_18.request.log
2025-12-18 15:19:37.494:INFO ejs.AbstractConnector:main: Started ServerConnector@4387b79e{HTTP/1.1, (http/1.1)}{0.0.0.0:51042}
2025-12-18 15:19:37.505:INFO ejs.Server:main: Started Server@6eda5c9{STARTING}[11.0.9,sto=0] @699ms
connected MQTT
$SYS/broker/clients/active
2025-12-18 15:19:37.946:INFO :czh.HikariDataSource:Thread-8: HikariPool-1 - Starting...
2025-12-18 15:19:38.324:INFO :czh.HikariDataSource:Thread-8: HikariPool-1 - Start completed.
Clients Active 0
$SYS/broker/clients/active
Clients Active 1

B4J Question MSSQL DRIVER Issue

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