Question # 1
Identify three unique integration features of Spring and WebLogic Server.
| | A. ability to automatically convert Spring application to JavaEE 6 framework
| | B. ability to export the WebLogic Container feature to another Spring enabled JavaEE
server.
| | C. ability to extend the WebLogic Server console with some Spring-related pages
| | D. official support of Spring apps inside WebLogic by Oracle Support
| | E. support for injection of WebLogic MBeans and Resources into Spring applications |
C. ability to extend the WebLogic Server console with some Spring-related pages
D. official support of Spring apps inside WebLogic by Oracle Support
E. support for injection of WebLogic MBeans and Resources into Spring applications
Spring Console Extension. WebLogic provides an Admin Console
extension for Spring to provide administrators with visual tools for monitoring the Spring
parts of deployed applications (first navigate to WebLogic Admin Console's Preferences |
Extension menu option and and enable spring-console). This Spring console extension is
basically a set of pages which are added amongst the normal pages of the standard
WebLogic admin console, rather than being a separate console per se. The extension
provides a view onto the values of the WebLogic generated Spring MBeans
D: If you have an issue, you use the Oracle Support organisation for help with WebLogic
specific problems and any Spring parts to your application are treated just like your own
custom code is, from an Oracle Support perspective.
E: WebLogic Injected Spring Beans is a Weblogic feature that is enabled by default.
Reference: WebLogic and Spring
Question # 2
In WebLogic 10.3.6 and WebLogic 12c on ExaLogic, performance of JMS is further
improved through _____ and _____.
| | A. Web Session Affinity
| | B. Concurrent Request Manager
| | C. Coherence
| | D. Elastic Message Overflow |
B. Concurrent Request Manager
D. Elastic Message Overflow
D: Elastic message overflow is the ability for WebLogic JMS to take advantage of solid
state disks, especially on Exalogic, for paging of JMS messages. This is especially
important in spikes of traffic. Access to SSD is much faster than disks or the database,
which are used for true persistent storage. This speed of writing and reading enables the
system to absorb the spikes in traffic.
Question # 3
You deployed a Java EE Shared Library and want to use it from an application that is also
deployed on the same cluster.
Which two manifest attributes must be specified at a minimum with corresponding values in
the deployment descriptor of the application that requires
| | A. Implementation-Version
| | B. Specification-Version
| | C. Extension-Name
| | D. Specification-Vendor | | E. Implementation-Vendor |
A. Implementation-Version
C. Extension-Name
When an application that references a shared library or package is deployed,
WebLogic Server checks the names and version string requirements against the libraries
registered with the server. If an exact match for a library or package name is not found, or if
the version requirements are not met, the application deployment fails.
If WebLogic Server finds a name and version string match for all of the libraries referenced
in the application, the server adds the libraries' classes to the classpath of the referencing
application and merges deployment descriptors from both the application and libraries in
memory. The resulting deployed application appears as if the referenced libraries were
bundled with the application itself.
Note:
As a best practice, your development team should always include version string information
for a library or optional package in the manifest file for the deployment. See Editing
Manifest Entries for Shared Libraries in Developing Applications for Oracle WebLogic
Server for more information.
If you are deploying a library or package that does not include version string information,
you can specify it at the command line using one or both of the following options:
libspecver—Defines a specification version for the library or package.
libimplver—Specifies an implementation version for the library or package.
Reference: Deploying Applications to Oracle WebLogic Server, Deploying Shared Java EE
Libraries and Dependent Applications
Question # 4
You are configuring the data source for an Oracle database. You will need to specify a test
table for WebLogic to test the status of the database. Which option should you choose?
| | A. a table name which has 100s of records
| | B. a table name which has 10s of records
| | C. a table name which has empty records
| | D. a table name which has 1000s of records
| | E. never use a table name |
C. a table name which has empty records
When you create a data source using the Administration Console, the
Administration Console automatically sets the Test Table Name attribute for a data source
based on the DBMS that you select. The Test Table Name attribute is used in connection
testing which is optionally performed periodically or when you create or reserve a
connection, depending on how you configure the testing options. For database tests to
succeed, the database user used to create database connections in the data source must
have access to the database table. If not, you should either grant access to the user (make
this change in the DBMS) or change the Test Table Name attribute to the name of a table
to which the user does have access (make this change in the WebLogic Server
Administration Console).
* To manually test a connection from a data source, you can use the Test Data Source
feature on the JDBC Data Source: Monitoring: Testing page in the Administration Console
(see “ Test JDBC data sources”) or the testPool() method in the
JDBCDataSourceRuntimMBean. To test a database connection from a data source, Test
Reserved Connections must be enabled and Test Table Name must be defined in the data
source configuration. Both are defined by default if you create the data source using the
Administration Console.
When you test a data source, WebLogic Server reserves a connection, tests it using the
query defined in Test Table Name, and then releases the connection.
Reference: Configuring and Managing JDBC Data Sources for Oracle WebLogic Server,
Tuning Data Source Connection Pools
Question # 5
What are the three steps you should take to tune a JDBC Connection pool in WebLogic
from the initial settings in a production environment?
| | A. Ensure the maximum size is increased to an appropriate setting.
| | B. Set the minimum and maximum size of the connection pool to the same value.
| | C. Increase the statement cache size.
| | D. Add more heap to the JVM.
| | E. Add more nodes to the cluster. |
A. Ensure the maximum size is increased to an appropriate setting.
C. Increase the statement cache size.
E. Add more nodes to the cluster.
Troubleshooting Slow Response Time from the Client and Low Database Usage
These symptoms are usually caused by a bottleneck upstream of the database, perhaps in
the JDBC connectionpooling. Monitor the active JDBC connections in the WebLogic
Console and watch for excessive waiters and wait times; increase the pool size, if
necessary.
* Attribute: Maximum Capacity
Maximum number of physical database connections that this connection pool can contain.
Different JDBC Drivers and database servers may limit the number of possible physical
connections.
C: Attribute: Statement Cache Size
The algorithm used to maintain the statement cache:
LRU - After the statementCacheSize is met, the Least Recently Used statement is removed
when a new statement is used.
Fixed - The first statementCacheSize number of statements is stored and stay fixed in the
cache. No new statements are cached unless the cache is manually cleared.
E: If the queue appears starved but adding execute threads does not improve performance,
there may be resource contention. Because CPU utilization is low, the threads are probably
spending much of their time waiting for some resource, quite often a database connection.
Use the JDBC monitoring facilities in the console to check for high levels of waiters or long
wait times. Adding connections to the JDBC connection pool may be all that is required to
fix the problem.
Note:
* If you had a JDBC connection pool where the Initial Capacity and Maximum Capacity
attributes were different, you might want to create a gauge monitor to monitor the maximum
and minimum number of connections.
By setting the Threshold Low value to be one less than the Initial Capacity, your gauge
monitor trapcould monitor the ActiveConnectionsCurrentCount attribute of the
JDBCDataSourceRuntime MBean and alert you whenever the number of active
connections are less than the Initial Capacity (which might indicate database connectivity
problems).
Question # 6
A customer has a development environment that uses the auto-deployment feature. The
customer claims the application is not redeployed even if the new version is copied to an
application subdirectory. Which two parameters of the configuration should you check?
| | A. Check if archive file in the compressed version has a new REDEPLOY file.
| | B. If server was started in the Development Mode. Auto-deployment is not supported in
production mode.
| | C. If the application includes an EJB 3 module. Auto-deployment is not supported for EJBs.
| | D. You change JVM from HotSpot to JRockit. Auto-deployment is not supported in HotSpot
auto deployment.
| | E. If the domain is a single-server domain. Auto-deployment is not supported in multiserver
domains. |
B. If server was started in the Development Mode. Auto-deployment is not supported in
production mode.
E. If the domain is a single-server domain. Auto-deployment is not supported in multiserver
domains.
Auto-deployment is intended for use with a single server target in a
development environment.
If auto-deployment is enabled, when an application is copied into the \autodeploy
directory of the Administration Server, the Administration Server detects the presence of
the new application and deploys it automatically (if the Administration Server is running). If
WebLogic Server is not running when you copy the application to the \autodeploy directory,
the application is deployed the next time the WebLogic Server Administration Server is
started. Auto-deployment deploys only to the Administration Server.
* Limitations of Auto-Deployment
Auto-deployed applications are very convenient in a development environment, but there
are some limitations:
There is no configuration in config.xml for an auto-deployed application. Therefore, in the
Administration Console, there are no notes or target pages associated with an autodeployed
application because there is no backing configuration for that information.
You cannot associate an auto-deployed application with a deployment plan since autodeployed
applications do not support any configuration operations which would be reflected
in a deployment plan.
You cannot set up security policies or roles for auto-deployed applications.
You cannot undeploy or redeploy auto-deployed applications using WebLogic Server tools.
Reference; Developing Applications for Oracle WebLogic Server 12c, Auto-Deploying
Applications in Development Domains
Question # 7
For real time event processing, which three clients can you use?
| | A. Java
| | B. C++
| | C. NET
| | D. REST |
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