Spring Boot app: Not picking up application.properties?

Question

I have a spring boot app I got here: https://github.com/christophstrobl/spring-data-solr-showcase/tree/4b3bbf945b182855003d5ba63a60990972a9de72

It compiles and works fine with: mvn spring-boot:run

However, when I click "run as Spring Boot app" in Spring Tools Suite, I get an error about not being able to find ${solr.host} which is set up in the application.properties file.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void org.springframework.data.solr.showcase.product.ProductServiceImpl.setProductRepository(org.springframework.data.solr.showcase.product.ProductRepository); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productRepository': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'solr.host' in string value "${solr.host}" 

My applications.properties file looks like this:

# SPRING MVC spring.view.suffix=.jsp spring.view.prefix=/WEB-INF/views/  # SOLR solr.host=http://192.168.56.11:8983/solr 

The relevant class looks like this (the only place where the $solr.host variable is used). Also, if I directly address the SOLR server's IP (as in the commented code) the app starts fine.

* Copyright 2012 - 2014 the original author or authors.  *  * Licensed under the Apache License, Version 2.0 (the "License");  * you may not use this file except in compliance with the License.  * You may obtain a copy of the License at  *  * http://www.apache.org/licenses/LICENSE-2.0  *  * Unless required by applicable law or agreed to in writing, software  * distributed under the License is distributed on an "AS IS" BASIS,  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  * See the License for the specific language governing permissions and  * limitations under the License.  */ package org.springframework.data.solr.showcase.config;  import org.apache.solr.client.solrj.SolrServer; import org.apache.solr.client.solrj.impl.HttpSolrServer; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import org.springframework.context.annotation.PropertySources; import org.springframework.data.solr.core.SolrTemplate; import org.springframework.data.solr.repository.config.EnableSolrRepositories; import org.springframework.data.solr.server.SolrServerFactory; import org.springframework.data.solr.server.support.MulticoreSolrServerFactory;  /**  * @author Christoph Strobl  */ @Configuration @EnableSolrRepositories(basePackages = { "org.springframework.data.solr.showcase.product" })  public class SearchContext {      @Bean     public SolrServer solrServer(@Value("${solr.host}") String solrHost) {         return new HttpSolrServer(solrHost);     }  //  @Bean //  public SolrServer solrServer(@Value("http://192.168.56.11:8983/solr") String solrHost) { //      return new HttpSolrServer(solrHost); //  }      @Bean     public SolrServerFactory solrServerFactory(SolrServer solrServer) {         return new MulticoreSolrServerFactory(solrServer);     }      @Bean     public SolrTemplate solrTemplate(SolrServerFactory solrServerFactory) {         return new SolrTemplate(solrServerFactory);     }  } 

I'm including that "ProductRepository" -- the one mentioned in the error -- although there isn't much going on there...

* Copyright 2012 - 2014 the original author or authors.  *  * Licensed under the Apache License, Version 2.0 (the "License");  * you may not use this file except in compliance with the License.  * You may obtain a copy of the License at  *  * http://www.apache.org/licenses/LICENSE-2.0  *  * Unless required by applicable law or agreed to in writing, software  * distributed under the License is distributed on an "AS IS" BASIS,  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  * See the License for the specific language governing permissions and  * limitations under the License.  */ package org.springframework.data.solr.showcase.product;  import java.util.Collection;  import org.springframework.data.domain.Page; import org.springframework.data.domain.Pageable; import org.springframework.data.solr.core.query.Query.Operator; import org.springframework.data.solr.repository.Query; import org.springframework.data.solr.repository.SolrCrudRepository; import org.springframework.data.solr.showcase.product.model.Product;  /**  * @author Christoph Strobl  */ interface ProductRepository extends SolrCrudRepository<Product, String> {      @Query(fields = { SearchableProductDefinition.ID_FIELD_NAME, SearchableProductDefinition.NAME_FIELD_NAME,             SearchableProductDefinition.PRICE_FIELD_NAME, SearchableProductDefinition.FEATURES_FIELD_NAME,             SearchableProductDefinition.AVAILABLE_FIELD_NAME }, defaultOperator = Operator.AND)     Page<Product> findByNameIn(Collection<String> names, Pageable page);  } 

I've got what seems like a "standard" file structure... code in src/main/java and so on. The application.properties file resides in src/main/resources.

Any suggestions gratefully accepted.

(Quick addition: This is running Tomcat as the embedded server)

Answer 1

This was obscure - and the other answers were very helpful in getting me pointed in the right direction.

After trying the suggested solutions, I poked around deeper and found this in Project Properties --> Java Build Path --> Source(tab) --> Source folders on build path: [Exclusion section]

**/application.properties 

Removing the exclusion fixed the issue and the values were picked up from the application.properties file during startup.

It may be worth noting that running this from the command line (in the directory with the .project file) bypassed the exclusion problem and worked fine.

mvn spring-boot:run