Fix plugin repositories order in build script
Issue #3823

Fix plugin repositories order in build script
Issue #3823

Fix plugin repositories order in build script
Issue #3823

Fix plugin repositories order in build script
Issue #3823

Update maven plugins to latest versions

Replace usage of "build" directory with "target"

Add maven-jar-plugin configuration

Tweak documentation generation process
* Update and filter distribution resources
* Use maven's `site` phase instead of `verify`
  to generate docs/distribution

Update build process documentation

Add maven gpg plugin to sign artifacts

Update configuration to run unit/integration tests separately
This commit updates the configuration to run unit tests
with maven-surefire-plugin and integration tests with
maven-failsafe-plugin. JSR-352 TCK tests are considered
as integration tests and are executed with other integration
tests (no need for a separate profile to run them).

Some unit tests were failing when integration tests were
skipped.. Those tests have been temporarily ignored.

Add maven profile to run test coverage analysis with jacoco

Re-organize dependencies

Add maven wrapper files

Add flatten-maven-plugin configuration

Add maven deploy plugin

Fix plugin repositories order in build script
Issue #3823

Fix ignored tests

Remove ignored test suites
Signed-off-by: Mahmoud Ben Hassine <mbenhassine@vmware.com>

Merge spring-batch-core-tests in spring-batch-core

Merge spring-batch-infrastructure-tests in spring-batch-infrastructure

Move BatchMessageListenerContainer to src/test

Remove ignored test
Based on the commit message of df1783a7, this
test has no added value.

Move BatchMessageListenerContainer to src/test

Merge spring-batch-infrastructure-tests in spring-batch-infrastructure

Merge spring-batch-core-tests in spring-batch-core

Polish contribution cbdb251441968197aca805cdda4e634ab8542c39
* Fix assertion messages in tests
* Use transactional tests instead of a separate
  service with a transactional method

Downgrade spring framework version to v5.0.15

Revert "Downgrade commons-dbcp2 to v2.2.0"
This reverts commit 339fd609

Revert "Explicitly considering Start Time not being null for running Job Executions"
This reverts commit f8f8a02a

Use H2 instead of HSQLDB for tests

Revert "Use isolation level READ_COMMITTED for tests"

Update gradle version to 6.7

Update sonarqube plugin version to 3.0

Update "what's new" section for version 5.0

Update dependencies

Upgrade JUnit version to 4.13.1

Fix plugin repositories order in build script
Issue #3823

Move docs to src directory

Move docs to src directory

Add maven central to buildscript repository

Polish contribution feb46fd3f74716db42e2d34639d4a6952e7267e5
* Update year in license header
* Use "this" keyword where appropriate

Polish contribution cbdb251441968197aca805cdda4e634ab8542c39
* Fix assertion messages in tests
* Use transactional tests instead of a separate
  service with a transactional method

Update build to resolve dependencies from maven central first

Update build to resolve dependencies from maven central first

Polish contribution cbdb251441968197aca805cdda4e634ab8542c39
* Fix assertion messages in tests
* Use transactional tests instead of a separate
  service with a transactional method

Fix KafkaItemReaderTests
Tests in this class fail intermittently because
they send messages to Kafka in an asynchronous
way and assert on the results immediately without
waiting for the send operation to complete.

This commit updates the tests to wait for
send results before asserting on them
(similar to a140a9f5).

Fix PartitionParserTests
Some tests in PartitionParserTests were
failing intermittently due to the usage
of non-synchronized shared state between
concurrent threads.

This commit updates the test code to use
`AtomicInteger` instead of `int` for the
state shared between concurrent threads.

Fix flaky tests
JsrSplitParsingTests#test and DecisionStepTests#testDecisionAfterSplit
were failing intermittently with:

```
org.springframework.batch.core.JobExecutionException: Flow execution ended unexpectedly
    at org.springframework.batch.core.jsr.job.flow.JsrFlowJob.doExecute(JsrFlowJob.java:88) ~[main/:?]
    at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:320) [main/:?]
    at org.springframework.batch.core.jsr.launch.JsrJobOperator$2.run(JsrJobOperator.java:674) [main/:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_232]
Caused by: org.springframework.batch.core.job.flow.FlowExecutionException: Ended flow=flow1.step1 at state=flow1.step1.flow1.step1 with exception
    at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:178) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:94) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:91) ~[main/:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_232]
    ... 1 more
Caused by: org.springframework.dao.ConcurrencyFailureException: PreparedStatementCallback; SQL [INSERT INTO BATCH_STEP_EXECUTION_CONTEXT (SHORT_CONTEXT, SERIALIZED_CONTEXT, STEP_EXECUTION_ID) VALUES(?, ?, ?)]; transaction rollback: serialization failure; nested exception is java.sql.SQLTransactionRollbackException: transaction rollback: serialization failure
    at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:73) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:70) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:79) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1541) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:667) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:960) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:1015) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.persistSerializedContext(JdbcExecutionContextDao.java:236) ~[main/:?]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.saveExecutionContext(JdbcExecutionContextDao.java:189) ~[main/:?]
    at org.springframework.batch.core.repository.support.SimpleJobRepository.add(SimpleJobRepository.java:177) ~[main/:?]
    at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_232]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_232]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:371) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:134) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.0.jar:5.3.0]
    at com.sun.proxy.$Proxy41.add(Unknown Source) ~[?:?]
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:68) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:68) ~[main/:?]
    at org.springframework.batch.core.jsr.job.flow.support.state.JsrStepState.handle(JsrStepState.java:53) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:94) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:91) ~[main/:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_232]
    ... 1 more
Caused by: java.sql.SQLTransactionRollbackException: transaction rollback: serialization failure
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.8.0.jar:2.8.0]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.8.0.jar:2.8.0]
    at org.springframework.jdbc.core.JdbcTemplate.lambda$update$2(JdbcTemplate.java:965) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:651) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:960) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:1015) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.persistSerializedContext(JdbcExecutionContextDao.java:236) ~[main/:?]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.saveExecutionContext(JdbcExecutionContextDao.java:189) ~[main/:?]
    at org.springframework.batch.core.repository.support.SimpleJobRepository.add(SimpleJobRepository.java:177) ~[main/:?]
    at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_232]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_232]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:371) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:134) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.0.jar:5.3.0]
    at com.sun.proxy.$Proxy41.add(Unknown Source) ~[?:?]
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:68) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:68) ~[main/:?]
    at org.springframework.batch.core.jsr.job.flow.support.state.JsrStepState.handle(JsrStepState.java:53) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:94) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:91) ~[main/:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_232]
    ... 1 more
Caused by: org.hsqldb.HsqlException: transaction rollback: serialization failure
    at org.hsqldb.error.Error.error(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.error.Error.error(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.Session.handleAbortTransaction(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.Session.executeCompiledStatement(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.Session.execute(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source) ~[hsqldb-2.5.1.jar:2.5.1]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.8.0.jar:2.8.0]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.8.0.jar:2.8.0]
    at org.springframework.jdbc.core.JdbcTemplate.lambda$update$2(JdbcTemplate.java:965) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:651) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:960) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:1015) ~[spring-jdbc-5.3.0.jar:5.3.0]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.persistSerializedContext(JdbcExecutionContextDao.java:236) ~[main/:?]
    at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.saveExecutionContext(JdbcExecutionContextDao.java:189) ~[main/:?]
    at org.springframework.batch.core.repository.support.SimpleJobRepository.add(SimpleJobRepository.java:177) ~[main/:?]
    at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_232]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_232]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:371) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:134) ~[spring-tx-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.0.jar:5.3.0]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.0.jar:5.3.0]
    at com.sun.proxy.$Proxy41.add(Unknown Source) ~[?:?]
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:68) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:68) ~[main/:?]
    at org.springframework.batch.core.jsr.job.flow.support.state.JsrStepState.handle(JsrStepState.java:53) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:94) ~[main/:?]
    at org.springframework.batch.core.job.flow.support.state.SplitState$1.call(SplitState.java:91) ~[main/:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_232]
    ... 1 more
```

This failure is due to a concurrency issue when executing
the split flow with the default SimpleAsyncTaskExecutor.

Several attempts have been made to fix this issue with no success:

* use `@DirtiesContext` annotation
* use a separate db for each test
* use `READ_COMMITTED` isolation level in the job repository
* downgrade hsqldb from v2.5.1 to v2.4.1 (since v2.5.1 has
introduced several changes in the MVCC mode)

The issue seems to be related to how the in-memory database
is shared between tests *and* how the test context is cached
(ie the combination of both).

This commit moves these tests to a separate test class which
seem to fix the issue.

Fix OptimisticLockingFailureTests#testAsyncStopOfStartingJob
This test was failing intermittently due to an incorrect
way of waiting for a job execution to finish, which is:

```
while(jobExecution.isRunning()) {
   // wait for async launched job to complete execution
}
```

`JobExecution#isRunning()` is based on the status
of the job execution in memory which might not be
persisted yet. Here is an excerpt from the Javadoc:

```
Test if this JobExecution indicates that it is
running. It should be noted that this does not
necessarily mean that it has been persisted as
such yet.
```

That's why in the case where `isRunning` returns
false and the JobExecution is not persisted yet
(which is still in a running status in db),
the second attempt of re-running the job fails
with a `JobExecutionAlreadyRunningException`.

This commit fixes the loop by continuously
checking the status of the Job execution
in the job repository until it reaches one
of the end statuses.

Issue #1121

Remove unused code in DecisionStepTests

Fix build

Remove unused code in DecisionStepTests

Remove outdated retry documentation
Spring Retry was pulled out of Spring Batch since 2.2.
The documentation of Spring Retry has evolved since then,
and the retry section of the batch docs is now out of sync.

This commit removes the outdated documentation while
keeping the link to Spring Retry.