Is it possible to use BYTEA fields with Spring Data JDBC (not JPA) - spring

Question

I'm trying to read a row in a Postgresql table that has a BYTEA field, using Spring Data JDBC, and it's failing with a Couldn't find PersistentEntity for type byte! MappingException. The method is failing in org.springframework.data.jdbc.core.EntityRowMapper.populateProperties, where it's interpreting byte[] as isCollectionLike and (I suppose) trying to create SQL to read it as a PostgreSQL array of bytes, rather than the blob it is.
There's plenty of examples for how to do this with JPA or manual JdbcTemplate, but the documentation for Spring Data JDBC is less rich. I can't imagine I'm the first one to hit this issue.
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:782) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:763) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:318) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at markscottwright.Application.main(Application.java:18) ~[classes/:na]
Caused by: org.springframework.data.mapping.MappingException: Couldn't find PersistentEntity for type byte!
at org.springframework.data.mapping.context.MappingContext.getRequiredPersistentEntity(MappingContext.java:79) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.jdbc.core.SqlGeneratorSource.lambda$getSqlGenerator$0(SqlGeneratorSource.java:41) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705) ~[na:na]
at org.springframework.data.jdbc.core.SqlGeneratorSource.getSqlGenerator(SqlGeneratorSource.java:40) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.core.DefaultDataAccessStrategy.sql(DefaultDataAccessStrategy.java:360) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.core.DefaultDataAccessStrategy.findAllByProperty(DefaultDataAccessStrategy.java:252) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.core.EntityRowMapper.populateProperties(EntityRowMapper.java:94) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.core.EntityRowMapper.mapRow(EntityRowMapper.java:74) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:94) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:61) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:678) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:616) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:668) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:693) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:747) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:215) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:227) ~[spring-jdbc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.jdbc.core.DefaultDataAccessStrategy.findAll(DefaultDataAccessStrategy.java:217) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.core.JdbcAggregateTemplate.findAll(JdbcAggregateTemplate.java:171) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at org.springframework.data.jdbc.repository.support.SimpleJdbcRepository.findAll(SimpleJdbcRepository.java:84) ~[spring-data-jdbc-1.0.9.RELEASE.jar:1.0.9.RELEASE]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:359) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:644) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:608) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at com.sun.proxy.$Proxy44.findAll(Unknown Source) ~[na:na]
at markscottwright.Application.run(Application.java:23) ~[classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:779) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
... 5 common frames omitted
2019-08-20 13:36:00.335 INFO 10604 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2019-08-20 13:36:00.344 INFO 10604 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
My table:
CREATE TABLE IF NOT EXISTS test_entity (
id INTEGER PRIMARY KEY,
byte_array BYTEA
);
insert into test_entity values (1, decode('00010203', 'hex'));
TestEntity.java
package markscottwright;
import org.springframework.data.annotation.Id;
public class TestEntity {
#Id
public Long id;
public byte[] byteArray;
}
TestEntityRepository.java
package markscottwright;
import org.springframework.data.repository.CrudRepository;
public interface TestEntityRepository extends CrudRepository<TestEntity, Long> {
}
My Application.java
package markscottwright;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
#EnableJdbcRepositories
#SpringBootApplication
public class Application implements CommandLineRunner {
#Autowired
TestEntityRepository testEntities;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
#Override
public void run(String... args) throws Exception {
testEntities.findAll().forEach(System.out::println);
}
}
My pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>markscottwright</groupId>
<artifactId>springdata-bytea</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
</parent>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Answer 1

This was implemented as part of DATAJDBC-327 and DATAJDBC-259 they are available in the 1.1.x builds.
The most current one is 1.1.0.RC2 available from the milestone repository https://repo.spring.io/milestone