Spring Data and Named Parameters

August 08, 2017

Having got used to Spring figuring out the name of parameters based on the name of the passed in names I was surprised when using Spring Data that I got the error

Name for parameter binding must not be null or empty! For named parameters you need to use @Param for query method parameters on Java versions < 8

A lot when I tested my new app. I have Java 8 so all should be good, but it wasn’t.

So I attempted to set the compiler options in maven as per the example

i.e

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>${maven-compiler-plugin.version}</version>
  <configuration>
	  <source>${java.version}</source>
	  <target>${java.version}</target>
	  <compilerArgument>-parameters</compilerArgument>
  </configuration>
</plugin>

That didn’t work, it also didn’t fit with the options I current had so I tried

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>${maven-compiler-plugin.version}</version>
  <configuration>
    <source>${java.version}</source>
    <target>${java.version}</target>
    <compilerArgs>
      <arg>-Xlint</arg>
      <arg>-parameters</arg>
    </compilerArgs>
  </configuration>
</plugin>

Still no joy.

Thought it might be that I’m running Tomcat from IntelliJ so set it’s compiler to pass the -parameters flag.

At that point I’ve stopped for now and just added @Param("parameterName") for anything that needed it.

Written by David Kerwick who lives and works Dublin as a Java Technical Lead.