Pass Array From Java to PLSQL Stored Procedure

Question

I am trying to pass Java array to PLSQL stored procedure, however when I am trying to execute, I am getting the following exception

java.sql.SQLException: Inconsistent java and sql object types

My DAO class code snippet

List projectList = new ArrayList();

public void saveRecord(List<Project> project) 
                       throws DatabaseException,SQLException {

    for (Project items: project) {
        insertRecord(items);
    }
}

private void insertRecord(Project project) throws SQLException {
    projectList.add(project);

callablestatement = 
         (OracleCallableStatement)connection.prepareCall("{call my_proc(?)}");

Object[] project1 = projectList.toArray();

StructDescriptor projectTypeDesc = StructDescriptor.createDescriptor("MY_TYPE",
conn);

STRUCT structProject1 = new STRUCT(projectTypeDesc, 
connection, project);

STRUCT[] structArrayOfProjects = {structProject1};

 ArrayDescriptor projectTypeArrayDesc = ArrayDescriptor.createDescriptor
("MY_ARRAY", connection); 

ARRAY arrayOfProjects = new ARRAY(projectTypeArrayDesc, connection,
structArrayOfProjects);// error in this line

callablestatement.setArray(1, arrayOfProjects);  

How can I resolve this issue?

Edit 1

If I do as

Object[] project1 = new Object[]{project.getProjectId(), project.getProjectTitle()};

then no errors and records are inserted into table.

However if I would do as

Object[] project1 = projectList.toArray();

then exception is thrown Inconsistent java and sql object types

Answer 1

As I have already said in the other thread, you have to assign fields of Project object to an array of Object , while you are assigning the whole array of Project objects. You can do what you want, but, as I have already said in the other thread, you have to loop through the list of projects and create a STRUCT object for each element in the list, holding each project's fields:

StructDescriptor projectTypeDesc = StructDescriptor.createDescriptor("MY_TYPE",
connection);

// array holding structs, where each struct is based on an array
//   with fields of Project object
STRUCT[] projectsAsStructs = new STRUCT[projectList.size()];

// for each Project object, create a STRUCT object containing its fields
for (int i = 0; i < projectList.size(); ++i) {
  Project project = projectList.get(i);

  Object[] projectFields = new Object[] {project.getProjectId(),
                                         project.getProjectTitle()};

  STRUCT projectStruct = new STRUCT(projectTypeDesc,
                                    connection, projectFields);

  projectsAsStructs[i] = projectStruct;
}

// now you have all your Project objects ready to be saved in one go:
ArrayDescriptor projectTypeArrayDesc = ArrayDescriptor.createDescriptor
("MY_ARRAY", connection); 

ARRAY arrayOfProjects = new ARRAY(projectTypeArrayDesc, connection,
                                  projectsAsStructs);

callablestatement.setArray(1, arrayOfProjects);