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PO@Value annotations inside my Java class don't load values from .properties file
 

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  1. PO@Value annotations inside my Java class don't load values from .properties file
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    <p>Before asking this question I tried to follow the following questions which are similar:</p> <p><a href="https://stackoverflow.com/questions/6425795/injecting-properties-using-spring-annotation-value">Injecting Properties using Spring &amp; annotation @Value</a></p> <p><a href="https://stackoverflow.com/questions/317687/how-can-i-inject-a-property-value-into-a-spring-bean-which-was-configured-using">How can I inject a property value into a Spring Bean which was configured using annotations?</a></p> <p><a href="https://stackoverflow.com/questions/15037359/loading-up-properties-file-to-a-class-in-spring">Loading up properties file to a class in Spring</a></p> <p>However, in my case I am not using any web applications or Tomcat; I'm just trying to load a cluster.properties file into a regular Java project via Spring so I can then ingest dummy data into Accumulo. Also, I'm trying to load properties from a cluster.properties file, not from key value pairs defined in an xml file.</p> <p>Using what I learned from the links above and lots of reading on Spring, here's what I have:</p> <p>I created the following context.xml file:</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"&gt; &lt;!-- Define the Spring Bean to load our cluster properties --&gt; &lt;bean id="props" class="accumuloIngest.LoadProperties"&gt;&lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>And here is a small snippet of what my cluster.properties file looks like:</p> <pre><code> cluster.instance=instance cluster.username=user etc... </code></pre> <p>Next, I created the following Spring main method under the class MainApp.java:</p> <pre><code> package accumuloIngest; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class MainApp { // Spring main method used to load a cluster.properties file with the Spring framework public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("context.xml"); LoadProperties myObj = LoadProperties.class.cast(ctx.getBean("props")); // Now print out the cluster.properties loaded by Spring to verify they aren't null StringBuffer springPropsBuffer = new StringBuffer(); springPropsBuffer.append("Printing out cluster.properties read via Spring..."); springPropsBuffer.append("\n\n"); springPropsBuffer.append("instanceName= "); springPropsBuffer.append(myObj.getInstanceName()); springPropsBuffer.append("\n"); springPropsBuffer.append("userName= "); springPropsBuffer.append(myObj.getUserName()); springPropsBuffer.append("\n"); springPropsBuffer.append("password= "); springPropsBuffer.append(myObj.getPassword()); springPropsBuffer.append("\n"); springPropsBuffer.append("zooServers= "); springPropsBuffer.append(myObj.getZooServers()); springPropsBuffer.append("\n"); springPropsBuffer.append("tableName= "); springPropsBuffer.append(myObj.getTableName()); springPropsBuffer.append("\n"); springPropsBuffer.append("dataFile= "); springPropsBuffer.append(myObj.getDataFile()); springPropsBuffer.append("\n"); springPropsBuffer.append("dataDelim= "); springPropsBuffer.append(myObj.getDataDelim()); springPropsBuffer.append("\n"); springPropsBuffer.append("rowCount= "); springPropsBuffer.append(myObj.getRowCount()); springPropsBuffer.append("\n"); System.out.println(springPropsBuffer.toString()); // now start data ingest myObj.startIngest(); // method that calls Ingester class to start data ingest } // end of main method } // end of MainApp class </code></pre> <p>Spring loads my context.xml file and loads the Bean I called "props", but the values are still null. It seems that my @Value annotations aren't working in my LoadProperties class:</p> <pre><code> package accumuloIngest; import java.io.IOException; import org.apache.accumulo.core.client.AccumuloException; import org.apache.accumulo.core.client.AccumuloSecurityException; import org.apache.accumulo.core.client.TableExistsException; import org.apache.accumulo.core.client.TableNotFoundException; import org.springframework.beans.factory.annotation.Value; import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer; import org.springframework.context.annotation.Bean; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource; public class LoadProperties { // this class defines the Spring Bean and loads the cluster properties // using the SpringFramework @Bean public static PropertyPlaceholderConfigurer props(){ PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer(); Resource[] resource = new ClassPathResource[ ] { new ClassPathResource("/EclipseProjectName/src/cluster.properties") }; ppc.setLocations(resource); ppc.setIgnoreUnresolvablePlaceholders(true); return ppc; } // Now load the properties from cluster.properties using the Spring Framework private @Value("${cluster.instance}") String instanceName; private @Value("${cluster.username}") String userName; private @Value("${cluster.password}") String password; private @Value("${cluster.zooServers}") String zooServers; private @Value("${cluster.TableName}") String tableName; private @Value("${cluster.DataFile}") String dataFile; private @Value("${cluster.DataDelimiter}") String dataDelim; private @Value("${cluster.rowCount}") int rowCount; // Getters for the other Java classes to access properties loaded by Spring public String getInstanceName() { return instanceName; } public String getUserName() { return userName; } public String getPassword() { return password; } public String getZooServers() { return zooServers; } public String getTableName() { return tableName; } public String getDataFile() { return dataFile; } public String getDataDelim() { return dataDelim; } public int getRowCount() { return rowCount; } // method to kick off the ingest of dummy data void startIngest() { Ingester ingestObject = new Ingester(); try { ingestObject.ingestData(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TableNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TableExistsException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (AccumuloException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (AccumuloSecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } // end of try-catch block } // end of startIngest method } // end of LoadProperties class </code></pre> <p>Yet when I run MainApp.java in Eclipse the values are null when my Ingester.java class calls the getters.</p> <p>Here's the console output when I run MainApp.java in Eclipse:</p> <pre><code> 13/09/24 14:08:24 INFO support.ClassPathXmlApplicationContext: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@191f667c: startup date [Tue Sep 24 14:08:24 EDT 2013]; root of context hierarchy 13/09/24 14:08:24 INFO xml.XmlBeanDefinitionReader: Loading XML bean definitions from class path resource [context.xml] 13/09/24 14:08:24 INFO support.DefaultListableBeanFactory: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3cdd17f5: defining beans [props]; root of factory hierarchy Printing out cluster.properties read via Spring... instanceName= null userName= null password= null zooServers= null tableName= null dataFile= null dataDelim= null rowCount= 0 Exception in thread "main" java.lang.IllegalArgumentException: argument was null:Is null- arg1? true arg2? true at org.apache.accumulo.core.util.ArgumentChecker.notNull(ArgumentChecker.java:36) at org.apache.accumulo.core.client.ZooKeeperInstance.&lt;init&gt;(ZooKeeperInstance.java:99) at org.apache.accumulo.core.client.ZooKeeperInstance.&lt;init&gt;(ZooKeeperInstance.java:85) at accumuloIngest.Ingester.ingestData(Ingester.java:65) at accumuloIngest.LoadProperties.startIngest(LoadProperties.java:69) at accumuloIngest.MainApp.main(MainApp.java:44) </code></pre> <p>Am I missing a piece of the Spring framework that loads the properties in my cluster.properties file? I had tried adding @AutoWired to both my MainApp and LoadProperties java classes but that didn't seem to help.</p>
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    1. COThere are a number of issues here. First, why does your context namespace declare Spring beans version 2.0 when you are using `@Bean` which was introduced in 3.0?
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    2. COYes, that was a copy/paste mistake on my part. I defined Spring Framework 3.2.4 in my pom.xml, so I modified my context.xml to use Spring beans version 3.2
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