Spring boot 2 @Query named parameter binding value

Question

We have the following working query using SpringBoot 1.5:

@Query(value = "SELECT DISTINCT c FROM Customer c INNER JOIN c.industry i WHERE " +
            "c.role IN :roleFilter " +
            "AND (:#{#industryFilter.size()} = 1 OR i.id IN :industryFilter) " +
            "AND (:searchString IS NULL " +
            "OR CONCAT_WS(' ', c.name, c.name2) LIKE CONCAT('%', :searchString, '%') " +
            "OR CONCAT_WS(' ', c.name2, c.name) LIKE CONCAT('%', :searchString, '%')) " +
            "AND (:includeDeleted = true OR c.deletedDate is NULL)",
            countQuery = "SELECT COUNT(DISTINCT c) FROM Customer c INNER JOIN c.industry i WHERE " +
                    "c.role IN :roleFilter AND " +
                    "(:#{#industryFilter.size()} = 1 OR i.id IN :industryFilter) " +
                    "AND (:searchString IS NULL " +
                    "OR CONCAT_WS(' ', c.name, c.name2) LIKE CONCAT('%', :searchString, '%') " +
                    "OR CONCAT_WS(' ', c.name2, c.name) LIKE CONCAT('%', :searchString, '%')) " +
                    "AND (:includeDeleted = true OR c.deletedDate is NULL)")
    Page<Customer> findCustomers(@Param("roleFilter") Set<Role> roleFilter,
                                 @Param("industryFilter") Set<String> industryFilter,
                                 @Param("searchString") String searchString,
                                 @Param("includeDeleted") boolean includeDeleted, Pageable pageable);

Please note how we pass the input to the LIKE: CONCAT('%', :searchString, '%')

After upgrading from springBootVersion = '1.5.17.RELEASE' to springBootVersion = '2.1.3.RELEASE' (we use Gradle) that query will fail at runtime with an exception:

org.hibernate.QueryException: Named parameter not bound : includeDeleted

Replacing CONCAT('%', :searchString, '%') with %:searchString% fixes the problem.

The question I have is: why?

By going into debug mode and following the full callstack, I could see the parameters being correctly retrieved from the method invocation as observed in JdkDynamicAopProxy at line 205 makes a call Object[] argsToUse = AopProxyUtils.adaptArgumentsIfNecessary(method, args); that results in:

argsToUse = {Object[5]@15562} 
 0 = {HashSet@15491}  size = 4
 1 = {HashSet@15628}  size = 1
 2 = null
 3 = {Boolean@15629} false
 4 = {PageRequest@15490} "Page request [number: 0, size 20, sort: name: ASC,name2: ASC]"

So far so good. Then, we keep going and the method to call is also correctly resolved:

parameterTypes = {Class[5]@15802} 
 0 = {Class@198} "interface java.util.Set"
 1 = {Class@198} "interface java.util.Set"
 2 = {Class@311} "class java.lang.String"
 3 = {Class@15811} "boolean"
 4 = {Class@9875} "interface org.springframework.data.domain.Pageable"

Then we go a bit further and we get to RepositoryFactorySupport line 599 calling private Object doInvoke(MethodInvocation invocation) throws Throwable which uses private final Map<Method, RepositoryQuery> queries; from the inner class public class QueryExecutorMethodInterceptor implements MethodInterceptor (I am unsure when/how was this variable created and populated), which contains all the queries annotated with @Query in my repository interface.

For our specific case, it contains an entry (last one) that matches the query I am invoking (findCustomers):

queries = {HashMap@16041}  size = 3
 0 = {HashMap$Node@16052} "public abstract com.swisscom.psp.domain.Customer com.swisscom.psp.repository.CustomerRepository.getOne(java.lang.String)" -> 
 1 = {HashMap$Node@16055} "public abstract boolean com.swisscom.psp.repository.CustomerRepository.existsWithRole(java.lang.String,java.util.Set)" -> 
 2 = {HashMap$Node@16058} "public abstract org.springframework.data.domain.Page com.swisscom.psp.repository.CustomerRepository.findCustomers(java.util.Set,java.util.Set,java.lang.String,boolean,org.springframework.data.domain.Pageable)" -> 

And expanding that entry I can see where the error comes from, the binding for the :includeDeleted named parameter is simply not there:

value = {SimpleJpaQuery@16060} 
 query = {ExpressionBasedStringQuery@16069} 
  query = "SELECT DISTINCT c FROM Customer c INNER JOIN c.industry i WHERE c.role IN :roleFilter  AND (:__$synthetic$__1 = 1 OR i.id IN :industryFilter) AND (:searchString IS NULL OR CONCAT_WS(' ', c.name, c.name2) LIKE CONCAT('%', :searchString, '%') OR CONCAT_WS(' ', c.name2, c.name) LIKE CONCAT('%', :searchString, '%')) AND (:includeDeleted = true OR c.deletedDate is NULL)"
  bindings = {ArrayList@16089}  size = 6
   0 = {StringQuery$InParameterBinding@16092} "ParameterBinding [name: roleFilter, position: null, expression: null]"
   1 = {StringQuery$ParameterBinding@16093} "ParameterBinding [name: __$synthetic$__1, position: null, expression: #industryFilter.size()]"
   2 = {StringQuery$InParameterBinding@16094} "ParameterBinding [name: industryFilter, position: null, expression: null]"
   3 = {StringQuery$ParameterBinding@16095} "ParameterBinding [name: searchString, position: null, expression: null]"
   4 = {StringQuery$ParameterBinding@16096} "ParameterBinding [name: searchString, position: null, expression: null]"
   5 = {StringQuery$ParameterBinding@16097} "ParameterBinding [name: searchString, position: null, expression: null]"

Now, I have the fix as mentioned earlier, but I would still very much like to know the following for future reference:

1. when and how is the private final Map<Method, RepositoryQuery> queries variable created and populated?
2. what exactly is causing this error? Did I miss something in the upgrade process? Am I using/mixing deprecated logic/wrong logic and should change the code further?

Our DB is MariaDB 10.1.36

EDIT: In all the places where this behaviour occurred (in some it still occurs), the unbound parameter is always the last one

EDIT2: Someone else also has a similar behaviour after the upgrade, why does this happen? reference

EDIT3: reference and also this weird behaviour has been reported. Interesting enough, I do not get the exception IF I pass already concatenated input to :searchString (eg: %SOMETHING%) and I do get the exception if I leave %:searchString% instead. And yes, moving those parameters in the end solves some errors I had with binding.

EDIT4: Maybe related bug?

Clearly there is something strange going on, so: how does this binding resolution happen exactly?

Thanks in advance and have a nice day

Answer 1

Actually, as far as I know, neither of your two approaches is the correct one to use here for handling LIKE with a wildcard placeholder. Instead, the LIKE expression should be:

LIKE :searchString

To this parameter :searchString you should be binding:

String searchString = "bananas";
String param = "%" + searchString + "%";
// then bind param to :searchString

That is, you bind the entire string, with the % wildcard, together. Then, let the database worry about how to escape it.