Estou tentando usar o QueryDslPredicateExecutor com MongoDB e Spring-Data, mas parece estar sufocando com a propriedade "existir ()".

Estou a usar -

org.springframework.boot:spring-boot-starter-parent:1.3.5.RELEASE  
com.querydsl:querydsl-mongodb:4.1.2  
com.querydsl:querydsl-apt:4.1.2  
org.mongodb.morphia:morphia:1.1.1  

Rastreamento de pilha

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property exists found for type Tree!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:77) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:329) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:309) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:272) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:235) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:373) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:353) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:84) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.query.PartTreeMongoQuery.<init>(PartTreeMongoQuery.java:60) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory$MongoQueryLookupStrategy.resolveQuery(MongoRepositoryFactory.java:168) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:435) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:220) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:266) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:252) ~[spring-data-commons-1.12.0.RELEASE.jar:na]
    at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:108) ~[spring-data-mongodb-1.9.0.RELEASE.jar:na]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    ... 30 common frames omitted

A exceção está sendo lançada dessa classe

package org.springframework.data.mapping
// PropertyPath.class 
....

/**
 * Creates a leaf {@link PropertyPath} (no nested ones with the given name and owning type.
 * 
 * @param name must not be {@literal null} or empty.
 * @param owningType must not be {@literal null}.
 * @param base the {@link PropertyPath} previously found.
 */
PropertyPath(String name, TypeInformation<?> owningType, List<PropertyPath> base) {

    Assert.hasText(name, "Name must not be null or empty!");
    Assert.notNull(owningType, "Owning type must not be null!");
    Assert.notNull(base, "Perviously found properties must not be null!");

    String propertyName = name.matches(ALL_UPPERCASE) ? name : StringUtils.uncapitalize(name);
    TypeInformation<?> propertyType = owningType.getProperty(propertyName);

    if (propertyType == null) {
        throw new PropertyReferenceException(propertyName, owningType, base);
    }

    this.owningType = owningType;
    this.isCollection = propertyType.isCollectionLike();
    this.type = propertyType.getActualType();
    this.name = propertyName;
}

A propriedade (método) é proveniente da classe QueryDslPredicateExecutor que meu Repositório estende.

public abstract boolean org.springframework.data.querydsl.QueryDslPredicateExecutor.exists(com.querydsl.core.types.Predicate)  

Aqui está o repositório -

public interface TreeRepository extends ExtendedMongoRepository<Tree, String>, QueryDslPredicateExecutor<Tree>{}