Connect Oracle database to Grails 3

Question

I am trying to use an Oracle database to a Grails project. I work with the command line tool.

So far:

• I have put the ojdb6 into a lib directory I had to create myself, at the root of my application

• I modified application.yml as follow:

   dataSource: pooled: true jmxExport: true driverClassName: oracle.jdbc.OracleDriver username: usrname password: pwd environments: development: dataSource: dbCreate: create-drop url: jdbc:oracle:thin:@//url:port/db test: dataSource: dbCreate: update url: jdbc:oracle:thin:@//url:port/db production: dataSource: dbCreate: update url: jdbc:oracle:thin:@//url:port/db properties: jmxEnabled: true initialSize: 5 maxActive: 50 minIdle: 5 maxIdle: 25 maxWait: 10000 maxAge: 600000 timeBetweenEvictionRunsMillis: 5000 minEvictableIdleTimeMillis: 60000 validationQuery: SELECT 1 validationQueryTimeout: 3 validationInterval: 15000 testOnBorrow: true testWhileIdle: true testOnReturn: false jdbcInterceptors: ConnectionState defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED 

• I also created a domain-class with an Integer attribute, just to give it a try.

However, it doesn't seem to work. I get a huge error message that doesn't even fit in my command window. When I use --stacktrace, the first message is "Failed to start server".

I've been trying to solve this problem for three days, any idea/comment will be welcome. Thank you kindly.

Side note: everythink works perfectly when I use the default database, not changing anything in the configuration.

Answer 1

Try below, it should work. if it doesn't post the stack trace. below snippet worked for me.

Add dependency: runtime 'oracle:ojdbc6:11.2.0.4.0'

Changes in application.yml:

environments:
    dataSource:
        pooled: true
        jmxExport: true
        driverClassName: org.h2.Driver
        username: sa
        password:


development:
    dataSource:
        dbCreate: validate
        url: jdbc:oracle:thin:@xxxx:1521:xx
        driverClassName: oracle.jdbc.OracleDriver
        dialect: org.hibernate.dialect.Oracle10gDialect
        username: "XXXXXX"
        password: "XXXXXX"
        properties:
           ***: **
           ***: **
test:
    dataSource:
        dbCreate: update
        url: jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE

production:
    dataSource:
        dbCreate: update
        url: jdbc:h2:prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
        properties:
            jmxEnabled: true
            initialSize: 5
            maxActive: 50
            minIdle: 5
            maxIdle: 25
            maxWait: 10000
            maxAge: 600000
            timeBetweenEvictionRunsMillis: 5000
            minEvictableIdleTimeMillis: 60000
            validationQuery: SELECT 1
            validationQueryTimeout: 3
            validationInterval: 15000
            testOnBorrow: true
            testWhileIdle: true
            testOnReturn: false
            jdbcInterceptors: ConnectionState
            defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED

Answer 2

On Oracle DB the validation statement (property validationQuery: SELECT 1) should be something like:

"SELECT 1 FROM DUAL"

Oracle does not support SELECT 1

Answer 3

I was having a similar issue recently and in my case it was due to using a format that did not match with my Oracle database configuration; this is what I found:

---

If your database uses an SID , your url should be in the form:

url: jdbc:oracle:thin:@url:port:sid ,

eg url: jdbc:oracle:thin:@192.168.1.44:1521:testdb

---

If your database uses a Service Name , your url should be in the form:

url: jdbc:oracle:thin:@//url:port/servicename

eg url: jdbc:oracle:thin:@//localhost:1521/testdb

---

Hope this helps