So I am working on a project wherein I need to connect to a MySQL using a web service. I will eventually write a client on Android but I haven't gotten that far yet.
What I have done so far:
- Created a MySQL database
- Created a "separate" (for testing connection) working class (as a simple java program, not web service) to try
out some simple SQL queries with my connection. This all worked like
expected.
- Next I followed THIS tutorial on setting up a web service for my
project.
This is where my problems start. So I already created the service, what I am doing now is RIGHT-CLICKING on my project and selecting RUN AS > Run On Server... I am using Eclipse Kepler by the way.
This is what I see in the console:
[INFO] The DBHelper service, which is not valid, caused java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.<init>(DefaultSchemaGenerator.java:140)
at org.apache.axis2.deployment.util.Utils.fillAxisService(Utils.java:453)
at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:388)
at org.apache.axis2.deployment.repository.util.ArchiveReader.buildServiceGroup(ArchiveReader.java:101)
at org.apache.axis2.deployment.repository.util.ArchiveReader.processServiceGroup(ArchiveReader.java:178)
at org.apache.axis2.deployment.ServiceDeployer.deploy(ServiceDeployer.java:82)
at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:813)
at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
at org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:142)
at org.apache.axis2.deployment.WarBasedAxisConfigurator.loadServices(WarBasedAxisConfigurator.java:283)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:95)
at org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:584)
at org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:454)
at org.apache.axis2.webapp.AxisAdminServlet.init(AxisAdminServlet.java:60)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com.dylanlegendre.notepal1.PropLoader.<init>(PropLoader.java:35)
at com.dylanlegendre.notepal1.DBHelper.<clinit>(DBHelper.java:17)
... 31 more
I'm not exactly sure what I may or may not be doing correctly. The server itself starts and I can go to the SERVICES link and it just shows as a faulty service with that message.
I have researched and tried a few different things. One of which was to make sure my MySQL Connector JAR was in the WEB-INF folder and changed my Build Path accordingly, but to no avail--same errors.
My project currently has TWO classes in it. The actual Service Class is the DBHelper class which I will use to interact with the database. The PropLoader class simply loads in my properties files that has the database connection information in it. The next logical step I will take is to attempt to get it all working WITHOUT the properties file and just hard code the connection information into the actual service class. But from what I THINK is the issue is that my JDBC isn't getting read? Am I wrong in this?
EDIT
So I tried my above solution and it worked. Now I just need to know WHY and/or how to remedy this situation. I removed my PropLoader instance and just put actual strings into the variables and it worked with no errors. So maybe you can't have an instance of another class in a web service is what I'm thinking? If so, how can I load from my properties file without creating an instance of it?
Anywho, here are the source codes for my two classes:
public class DBHelper {
private static PropLoader loader = new PropLoader("/WEB-INF/lib/info.cfg");
private final static String DRIVER_PATH = "com.mysql.jdbc.Driver";
private final static String DB_URL = loader.getDbConnection();
private final static String USER = loader.getDbUser();
private final static String PASSWORD = loader.getDbPass();
private static Connection conn;
private static Statement stmt;
private static String query;
private static ResultSet rs;
private static String msg; // the result of the query as a string
public static String getMsg() {
return msg;
}
public static void setMsg(String MESS) {
msg = MESS;
}
public static void openConnection() {
try {
Class.forName( DRIVER_PATH ).newInstance();
conn = DriverManager.getConnection( DB_URL, USER, PASSWORD );
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void closeConnection() {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
public static String executeSingleQuery(String QUERY1, String COLUMN_NAME) {
try {
stmt = conn.createStatement();
query = QUERY1;
rs = stmt.executeQuery(query);
while (rs.next()) {
msg = rs.getString(COLUMN_NAME);
}
} catch (SQLException e) {
e.printStackTrace();
}
return msg;
}
public static void executeQuery(String QUERY2, String COLUMN_NAME1) {
try {
stmt = conn.createStatement();
query = QUERY2;
rs = stmt.executeQuery(query);
while (rs.next()) {
msg = rs.getString(COLUMN_NAME1);
System.out.println(msg);
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public class PropLoader {
private Properties prop;
private String path;
private String dbConnection;
private String dbUser;
private String dbPass;
public PropLoader(String PATH) {
this.path = PATH;
this.prop = new Properties();
try {
InputStream fs = getClass().getResourceAsStream(path);
prop.load(fs);
// retrieve properties
this.dbConnection = prop.getProperty("dbConnection");
this.dbUser = prop.getProperty("dbUser");
this.dbPass = prop.getProperty("dbPass");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public String getDbConnection() {
return dbConnection;
}
public void setDbConnection(String dbConnection) {
this.dbConnection = dbConnection;
}
public String getDbUser() {
return dbUser;
}
public void setDbUser(String dbUser) {
this.dbUser = dbUser;
}
public String getDbPass() {
return dbPass;
}
public void setDbPass(String dbPass) {
this.dbPass = dbPass;
}
}