What Could Cause Java.Lang.Reflect.Invocationtargetexception

What could cause java.lang.reflect.InvocationTargetException?

You've added an extra level of abstraction by calling the method with reflection. The reflection layer wraps any exception in an InvocationTargetException, which lets you tell the difference between an exception actually caused by a failure in the reflection call (maybe your argument list wasn't valid, for example) and a failure within the method called.

Just unwrap the cause within the InvocationTargetException and you'll get to the original one.

I'm getting an java.lang.reflect.InvocationTargetException exception in JavaFX app and I have no idea how to fix it

You've got an initialization order issue. In your StartMenuCtrl constructor, you're passing a reference to this to the StartMenuUI constructor. The StartMenuUi constructor then calls initComponents, which calls startMenuCtrl.getStage()... but that method returns null because the StartMenuCtrl constructor has not finished executing, and has not yet initialized its primaryStage field.

Try reordering the lines in the StartMenuCtrl constructor so they're in this order:

this.primaryStage = new Stage(); // this needs to happen first!
this.startMenuUI = new StartMenuUI(this);

This problem illustrates why, generally speaking, it's best not to let the this reference escape during object construction.

java.lang.reflect.InvocationTargetException error javafx even though there is no code

Your main class extends javafx.application.Application needs to be public. Change your class as below.

package com.front.fire;

import javafx.application.Application;
import javafx.stage.Stage;

public class FrontFireMain extends Application{

    @Override
    public void start(Stage arg0) throws Exception {
        
    }

}

error: java.lang.reflect.InvocationTargetException

In the error message you have, there is this line:

Caused by: java.lang.IllegalArgumentException: Can not set java.awt.TextField field ihm_project.LoginController.Email to javafx.scene.control.TextField

so make sure that your text field "Email" is of type javafx.scene.control.TextField not java.awt.TextField

and to be sure that the type of TextField is the correct type, delete this line in your code import java.awt.*;, if no error occurs, it means that you are using the correct type

java.lang.reflect.InvocationTargetException: null

Root problem

Caused by: java.sql.SQLFeatureNotSupportedException: Method org.postgresql.jdbc.PgConnection.createClob() is not yet implemented.

Looks like bug https://hibernate.atlassian.net/browse/HHH-12368

They recommended set property (I believe it's the best workaround):

as workaround is to disable hibernate to detect this function by
setting flag hibernate.jdbc.lob.non_contextual_creation=true

The other solution described here: http://vkuzel.blogspot.com.cy/2016/03/spring-boot-jpa-hibernate-atomikos.html

Disable feature detection by this undocumented parameter. Check the org.hibernate.engine.jdbc.internal.JdbcServiceImpl.configure method for more details.
spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults = false

So you can also try to add to your Spring boot properties file

spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults = false

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