Java is a high-level, class-based, object-oriented programming language.
Introduction When it comes to serverless architechture, AWS Lambda is a real game changer. This article will walk you through the process of migrating a Java application from Tomcat to AWS Lambda. We will cover every aspect of the migration process, from the very basic setup to the more advanced customization. By the end of … Read more
We recently upgraded from Java 8 to openjdk16. And our webservice clients failed with below error. Failed to execute goal org.jvnet.jax-ws-commons:jaxws-maven-plugin:2.3:wsimport (MyWebServiceClient) on project com.myproject: Execution MyWebServiceClient of goal org.jvnet.jax-ws-commons:jaxws-maven-plugin:2.3:wsimport failed: start 0, end -1, length 0 -> [Help 1] And the fix was to change the plugin for ws-import. Before we had <groupId>org.jvnet.jax-ws-commons</groupId><artifactId>jaxws-maven-plugin</artifactId><version>2.3</version> And … Read more
While upgrading from hibernate 3 to hibernate 5, this was one of the issues. Here is how id fields were defined in hibernate 3. @[email protected](strategy=GenerationType.AUTO, generator=”my_seq_gen”)@SequenceGenerator(name=”my_seq_gen”, sequenceName=”MY_SEQ”)private long id; So now, I added allocationSize = 1 to resolve the issue @[email protected](strategy=GenerationType.AUTO, generator=”my_seq_gen”)@SequenceGenerator(name=”my_seq_gen”, sequenceName=”MY_SEQ”, allocationSize = 1)private long id; And for new Ids I used the … Read more
This turned out to be a mistake in the config. I was using mysql driver. It was a copy-paste mistake. <bean id=”dataSource” class=”org.apache.commons.dbcp2.BasicDataSource”destroy-method=”close”><property name=”driverClassName”><value>com.mysql.jdbc.Driver</value></property> Here is the correct config: <bean id=”dataSource” class=”org.apache.commons.dbcp2.BasicDataSource”destroy-method=”close”><property name=”driverClassName”> <value>org.postgresql.Driver</value></property> And the postgres entry in pom.xml : <dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId><version>42.2.23</version></dependency>
Resolving Spring Context Initialization Error: NoClassDefFoundError for ValidatorFactory The root cause of this issue is a java.lang.NoClassDefFoundError for the javax/validation/ValidatorFactory class. This error usually occurs when there’s a missing dependency in your project. In this case, it’s likely that you’re missing the Java Validation API (JSR 303) dependency. To resolve this issue, you need to … Read more
On upgrading Hibernate from version 3 to version 5, I got the above error. Turned out that we were also using Mockito and it also has a dependency on byte buddy. So there was conflict of versions of byet buddy. So here is fix: <dependency><groupId>org.mockito</groupId><artifactId>mockito-core</artifactId><version>2.2.28</version><scope>test</scope><exclusions><exclusion><groupId>net.bytebuddy</groupId><artifactId>byte-buddy</artifactId></exclusion></exclusions></dependency> exclude the byte-buddy jar from mockito.
I get this error a lot of times while building my GWT project. I have a get module imported from a jar which is downloaded from artifactory. GWT Module com.model.MyCommonModel not found in project sources or resources. -> [Help 1] So I usually resolve it by deleting the jar locally or by running mvn dependency:purge-local-repository … Read more
Recently we needed to reindex our data due to some changes. Here is how we did it. We defined a file on the file system. If that file is present the reindexing thread runs, so it would easy for our deployment team to run reindexing when needed. Here is the code creating the thread. So … Read more
Recently we ended up in an issue with enums. One of the developers changed the order of enums because of a change he had to do. And he thought that enum values that are logically together should be put together in enum class also. But when he was done with the change, all the tests … Read more
