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SQLSyntaxErrorException: ORA-00900: invalid SQL statement using Java

I need to use following via Java EXEC DBMS_STREAMS_ADM.SET_TAG(tag => HEXTORAW('17')); using a simple Database client. along with other usual select/delete queries but its complaining for invalid SQL statement.
I tried removing the exec as its for PL/SQL and calling it with {} but still I am getting the same error.

EXEC is SQL*Plus (Oracle's native SQL client) syntax and you can't use it here. The JDBC syntax for calling stored procedures is through the CALL directive. You can omit the parameter name in the call (tag => HEXTORAW('17')). For example:
try (CallableStatement cs
= myConnection.prepareCall("{ call DBMS_STREAMS_ADM.SET_TAG(HEXTORAW(?)) }")) {
cs.setString(1, "17");
cs.execute();
}
It is unclear which DBClient you are currently using (please tell us), but the following might work as well:
DBClient.execute("{ call DBMS_STREAMS_ADM.set_tag(HEXTORAW('17')) }");
or then
DBClient.execute("begin DBMS_STREAMS_ADM.SET_TAG(HEXTORAW('17')); end;");

What is the SQL equivalent of CallableStatement?

I have some code I'm trying to fix and a function is used within a CallableStatement but it seems that said function is called in a particular instance where a Schema of the Database becomes the entire 'see-able' database for the function.
Let me explain :
My database (in PostgreSQL) has multiple projects (schemas) such as i2b2test_project or i2b2test_project2. Each of these projects has an architecture of multiple tables, such as visit_dimension, patient_dimension, etc..
Now, if I want to reference the visit_dimension table from a i2b2test_project, I need to use i2b2test_project.visit_dimension, as any logical SQL syntax would suggest.
The problem is that, in the code (which I'll include below), a CallableStatement is used to execute a function (plain old load-table-from-temp-table function). This function references the architecture mentioned above as if only one project exists, as the database. In other words, instead of referencing i2b2test_project.visit_dimension, it only references visit_dimension.
I haven't found a way to execute a function in some sort of 'separated instance' of the database and as a result, the function can not be used in a plain SQL statement inside a DB terminal, errors such as visit_dimension table does not exist etc..
So I ask : Does the call statement (which indeed seems to reference the schema) allow for such a 'separated instance' of the database ? And is there a way to do so with a plain SQL statement ?
Code :
CallableStatement callStmt = conn.prepareCall("{call "
+ this.getDbSchemaName()
+ "INSERT_ENCOUNTERVISIT_FROMTEMP(?,?,?)}");
callStmt.setString(1, tempTableName);
callStmt.setInt(2, uploadId);
callStmt.registerOutParameter(3, java.sql.Types.VARCHAR);
callStmt.execute();

SQLException when executing a callablestatement

I am trying to call a Procedure from a package from my java application but receive an error. The code is set up like so...
------Java-----
Connection = conn;
String call_code="{? = call MY_PROCEDURE.Process_vale(?,?,?)}";
CallableStatement Process_cs=conn.prepareCall(call_code);
String bValue= "12345";
Process_cs.setString(1, bValue);
Process_cs.registerOutParameter(2, Types.INTEGER);
Process_cs.registerOutParameter(3, Types.VARCHAR);
Process_cs.execute();
The Procedure is setup like:
PROCEDURE Process_value (bValue VARCHAR2, PN_CD OUT NUMBER, PN_MSG OUT VARCHAR2).....
The Error I see is:
java.sql.SQLException: Missing IN or OUT parameter at index:: 4
I am curious as to why it mentions an index of 4, when the Procedure only has 3 parameters, I believe I am missing a critical fact here.

You have done some serious mistakes here. First Since you are calling a procedure you wont get any return value, only functions can have return values. So you have to call the procedure as follows.
String call_code="{call MY_PROCEDURE.Process_vale(?,?,?)}";
You could be successfully execute this if your procedure first parameter is IN type and other two parameters are OUT type.

What is 'call' meaning in JDBC callable statement?

I have faced this question in interview. What is call in JDBC callable statement. I know it is not key word.
For example we have following code
String SQL = "{call getEmpName (?, ?)}";
cstmt = conn.prepareCall (SQL);
what is call in the first statement represents?

call is used to execute a database stored procedure. Then, it's followed by the name of the stored procedure and parameters. In fact, this is how the SQL statement generally looks:
"{ ? = call getEmpName (?, ?)}"
Where the first parameter belongs to the output result from the stored procedure (if defined). If the stored procedure doesn't return any data, then this parameter can be omitted.

Oracle's function created via jdbc is in an invalid state

When I create Oracle's function in SQL Developer everything is ok, but when I create the same function via jdbc it is in invalid state
Here is the function sample:
create or replace function TEST_FUNC return number is
begin
return 100;
end;
Java code:
Connection con = ...;
Statement stmt = con.createStatement();
stmt.execute(sql);
When I execute function:
select TEST_FUNC() from dual;
I get error: ORA-06575: Package or function TEST_FUNC is in an invalid state
Can you explain what I'm doing wrong?

Function needed to be complied to use them. Not compiled function gives this exception. Also make sure you do not have any terminating CR/LF in your query. Copy it to a text editor (textpad) to see if you have any.