Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Pessoal sou iniciante,
Estou criando um cadastro de fornecedor mas quando coloco pra salvar aparece o erro

public class ControleFornecedor {

  ConectaBanco conn = new ConectaBanco();    

  public void Salvarforn(ModeloFornecedor mod){
    conn.conexao();
   
    try {
   PreparedStatement pst = conn.conn.prepareStatement("insert into fornecedor(Razaosocial_fornecedores,cnpj_fornecedores,inscricaoestadual_fornecedores,contato1_fornecedores,contato2_fornecedores,vendedor_fornecedores,cidade_fornecedores,cep_fornecedores,uf_fornecedores)values(?,?,?,?,?,?,?,?,?)");
   pst.setString(1, mod.getRazaosocial());
   pst.setString(2, mod.getCnpj());
   pst.setString(3, mod.getInscricaoestadual());
   pst.setString(4, mod.getContato1());
   pst.setString(5, mod.getContato2());
   pst.setString(6, mod.getVendedor());
   pst.setString(8, mod.getCidade());
   pst.setString(9, mod.getCep());
   pst.setString(10, mod.getUf());
   pst.execute();
        JOptionPane.showMessageDialog(null,"Dados inseridos com sucesso!");
   
    } catch (SQLException ex) {
        JOptionPane.showMessageDialog(null,"Erro na inserção do fornecedor!");
    }
    
    conn.desconecta();
}

o erro é esse

Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException

at Controle.ControleFornecedor.Salvarforn(ControleFornecedor.java:27)

at Formularios.frmFornecedores.SalvarfornActionPerformed(frmFornecedores.java:360)

at Formularios.frmFornecedores.access$700(frmFornecedores.java:17)

at Formularios.frmFornecedores$8.actionPerformed(frmFornecedores.java:157)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)

at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)

at java.awt.Component.processMouseEvent(Component.java:6535)

at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)

at java.awt.Component.processEvent(Component.java:6300)

at java.awt.Container.processEvent(Container.java:2236)

at java.awt.Component.dispatchEventImpl(Component.java:4891)

at java.awt.Container.dispatchEventImpl(Container.java:2294)

at java.awt.Component.dispatchEvent(Component.java:4713)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)

at java.awt.Container.dispatchEventImpl(Container.java:2280)

at java.awt.Window.dispatchEventImpl(Window.java:2750)

at java.awt.Component.dispatchEvent(Component.java:4713)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)

at java.awt.EventQueue$4.run(EventQueue.java:731)

at java.awt.EventQueue$4.run(EventQueue.java:729)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

CONSTRUÍDO COM SUCESSO (tempo total: 4 segundos)