It seems so, that if my WEB-INF/lib contains postgres driver then Tomcat
gives - No suitable driver found
Raivo
On Sat, Sep 30, 2023 at 10:18 AM Raivo Rebane <raivor...@gmail.com> wrote:
> I fix previous error what was my bad knowledge,
> But new error occur which is related to postgres postgis jars.
> If You are kind to answer me more;
>
> Java code is :
>
> public static boolean CheckIsNewInMushrooms(Connection connection, Point
> AddLocation, String AddDescription) {
>
> boolean IsNew = true;
>
>
> try {
>
> String sqlQuery = "SELECT location, description FROM mushrooms";
>
> try (PreparedStatement preparedStatement = connection.prepareStatement(
> sqlQuery)) {
>
> ResultSet resultSet = preparedStatement.executeQuery();
>
>
> while (resultSet.next()) {
>
> Point point = (Point) resultSet.getObject("location");
>
> String description = resultSet.getString("description");
>
>
> if (AddLocation.x == point.x && AddLocation.y == point.y && AddDescription
> .equals(description))
>
> IsNew = false;
>
> }
>
> }
>
> } catch (SQLException e) {
>
> e.printStackTrace();
>
> }
>
>
> return IsNew;
>
> }
>
> and at line
>
> Point point = (Point) resultSet.getObject("location");
>
>
> java.lang.ClassCastException: org.postgresql.util.PGobject cannot be cast
> to org.postgis.Point
> at
> MushroomAPIs.ProcAddMushrooms.CheckIsNewInMushrooms(ProcAddMushrooms.java:45)
> How to get Point from resultset ?
> Is it related to postgis driver ?
>
> Regards
> Raivo
>
> On Sat, Sep 30, 2023 at 9:33 AM Raivo Rebane <raivor...@gmail.com> wrote:
>
>> Hi,
>> sometimes I am lucky and don't get the old error, but sometime not.
>>
>> I tried to use PreparedStatement, but I got error -
>> org.postgresql.util.PSQLException: Can't use query methods that take a
>> query string on a PreparedStatement.
>> at
>> org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:145)
>> at MushroomAPIs.Clean.deleteAllRecordsFromTable(Clean.java:34)
>> and java code is -
>>
>> String deleteQuery = "DELETE FROM " + tableNam
>>
>> System.out.println(deleteQuery);
>>
>> PreparedStatement statement = connection.prepareStatement(deleteQuery);
>>
>> May be it's easy for me to use normal statement ?
>>
>>
>> Raivo
>>
>>
>> On Sat, Sep 30, 2023 at 8:27 AM Raivo Rebane <raivor...@gmail.com> wrote:
>>
>>> Sorry. I accidentally usin postgres 16, which was empty
>>> Many thanks for advise !!!
>>>
>>> Raivo
>>>
>>> On Sat, Sep 30, 2023 at 8:18 AM Raivo Rebane <raivor...@gmail.com>
>>> wrote:
>>>
>>>> May be I have to copy PostGis draiver also to tomcat/lib ?
>>>>
>>>> Raivo
>>>>
>>>> On Sat, Sep 30, 2023 at 8:01 AM Raivo Rebane <raivor...@gmail.com>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>> I copied the postgres driver to Tomcat/lib.
>>>>> PS C:\Program Files\Apache Software Foundation\Tomcat 9.0\lib> dir
>>>>> post*
>>>>> Directory: C:\Program Files\Apache Software Foundation\Tomcat
>>>>> 9.0\lib
>>>>> Mode LastWriteTime Length Name
>>>>> ---- ------------- ------ ----
>>>>> -a---- 28.09.2023 14:40 1081604 postgresql-42.6.0.jar
>>>>> but Tomcat remains to give error -
>>>>> java.sql.SQLException: No suitable driver found for
>>>>> jdbc:postgresql://localhost:5432/mushroom_database
>>>>> I am using Postgres 15. May be I have to use more older one ?
>>>>>
>>>>>
>>>>> Raivo
>>>>>
>>>>> On Sat, Sep 30, 2023 at 6:32 AM Craig McIlwee <cra...@vt.edu> wrote:
>>>>>
>>>>>> > for some reason the postgresql jar is not in the classpath.
>>>>>>
>>>>>> This is due to the way that Tomcat loads drivers, which is documented
>>>>>> at [1]. In short, the JDBC driver should be placed in the tomcat/lib
>>>>>> directory and removed from the application's WEB-INF/lib directory.
>>>>>> After
>>>>>> doing that, I was able to get past the "No suitable driver" exception.
>>>>>>
>>>>>> OP, you should read that entire page, and in particular the portion
>>>>>> at [2]. By registering a "Resource" with Tomcat, you can let it manage a
>>>>>> connection pool for you (if you aren't already using something like
>>>>>> PgBouncer or pgpool) and, if registered at the container level, in the
>>>>>> future you can share that pool across all of your web applications in the
>>>>>> container.
>>>>>>
>>>>>> [1]
>>>>>> https://tomcat.apache.org/tomcat-9.0-doc/jndi-datasource-examples-howto.html#DriverManager,_the_service_provider_mechanism_and_memory_leaks
>>>>>> [2]
>>>>>> https://tomcat.apache.org/tomcat-9.0-doc/jndi-datasource-examples-howto.html#PostgreSQL
>>>>>>
>>>>>> Craig
>>>>>>
>>>>>>>
