I Have a SpringBoot application . I have used the Java config in the entire application and it is working fine.
Now I have a reqirement to configure JMX for the same.
After going through some tutorials I found that I need to give the following configuration in my spring boot to have the JMX enabled.
#Bean
public MetadataNamingStrategy getNamingStrategy() {
MetadataNamingStrategy strategy = new MetadataNamingStrategy();
strategy.setAttributeSource(new AnnotationJmxAttributeSource());
return strategy;
}
#Bean
public MetadataMBeanInfoAssembler getMbeanInfoAssembler() {
return new MetadataMBeanInfoAssembler(new AnnotationJmxAttributeSource());
}
#Bean
public MBeanExporter getExporter() {
MBeanExporter exporter = new MBeanExporter();
exporter.setAutodetect(true);
exporter.setNamingStrategy(getNamingStrategy());
exporter.setAssembler(getMbeanInfoAssembler());
return exporter;
}
After doing this , I am able to see the classes (and their attributes, and operations) in JMX console (on HCP).
But for the classes that implement an interface ,I am not able to see them on JMX console.
Example:
I have an interface TestInterface2.
package com.test.example;
public interface TestInterface2 {
public String simpleTest2();
}
The implementation of the interface goes below.
#Component("testInterfaceImpl2")
#ManagedResource(objectName = "com.test.example:type=TestInterfaceImpl2", description = "TestInterface2 Desc")
public class TestInterfaceImpl2 implements TestInterface2 {
#Override
public String simpleTest2() {
return "Simple Test";
}
}
I tried this. It is not working.
But the following am able see in JMX console
#Component
#ManagedResource(
objectName = "com.test.example:type=FormHandler",
description = "Form Handler implementation")
public class FormHandler {
#implementation details here
}
Can someone suggest the best approach for doing this or why am i not able to get the interface implementations as MBean .
Related
I’m creating a console app and have recently started adding custom services to the IHost container so I can simply pass the IHost to any number of factory classes and have everything thing I need to configure them. But I’ve gotten stuck when it comes to adding Windows Event Logging as a service, could use some help getting past this.
My Main static method in Program calls CreateHostBuilder and returns an IHostBuilder as shown below.
public static IHostBuilder CreateHostBuilder(string[] args)
{
IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("appsettings.json");
IConfiguration configuration = configurationBuilder.Build();
var hostBuilder = Host.CreateDefaultBuilder(args)
.ConfigureLogging((hostContext, logging) =>
{
logging.ClearProviders();
logging.SetMinimumLevel(LogLevel.Information);
logging.AddEventLog(eventViewerSettings =>
{
eventViewerSettings.SourceName = "MeCore2";
eventViewerSettings.LogName = "Application";
eventViewerSettings.MachineName = ".";
});
})
.ConfigureServices(services => services.AddDbContext<MeCore2Context>())
// Add custom service for performing DNS queries
.ConfigureServices(services => services.AddTransient<IDnsQueryService>(DnsQueryFactory.Create))
// Add custom service for Managing Runtime Environment Settings
.ConfigureServices(services => services.AddTransient<IEnvironmentSettings>(EnvironmentSettingsFactory.Create))
// Add custom service for Managing String Extractions
.ConfigureServices(services => services.AddTransient<IExtractStringsService>(ExtraxtStringsFactory.Create))
// Add custom service for IP GeoLocation
.ConfigureServices(services => services.AddTransient<IIpGeolocationService>(IpGeolocationFactory.Create));
return hostBuilder;
}
My factory classes are implemented like this.
public static class DnsQueryFactory
{
public static DnsQueryService Create(IServiceProvider serviceProvider)
{
bool exceptionDisplayOnly = serviceProvider.GetRequiredService<IEnvironmentSettings>().WriteErrorsToEventLogs;
IHost host = serviceProvider.GetRequiredService<IHost>();
return new DnsQueryService(exceptionDisplayOnly, host);
}
}
And my concrete service constructors are implemented like this.
public DnsQueryService(bool exceptionDisplayOnly, IHost host)
{
this.exceptionDisplayOnly = exceptionDisplayOnly;
this.logger = host.Services.GetRequiredService<ILogger>();
this.environmentSettings = host.Services.GetRequiredService<IEnvironmentSettings>();
}
When I ran the app after setting up in this manner, I was unable to pull an ILogger from the host container, I could though, pull an ILoggerFactory then I needed to take some additional steps before I had a fully functional ILogger.
I would like to be able to pull the ILogger from the Host container with it fully configured and ready to use for exception handling, warnings, and basic information logging. But I'm stumped here as I can't seem to get the right syntax for using the ILoggingBuilder or ILoggerFactory into the Host container.
I started down the path of creating a static class EventLoggingServices that would accept an IServiceProvider finish out the configuration steps and return an ILogger, but this too has got me stumped. I'm close but not where I need to be and can't find a blog that covers this approach, either that or I'm going at this the wrong way, to begin with. Appreciate the help and thanks in advance.
I believe I've answered my own question with the following code, it is writing to the event logs. I implemented a factory method to encapsulate the ILogger as follows.
public static class EventLoggingFactory
{
public static ILogger<IEventLogging> Create(IServiceProvider serviceProvider)
{
return new EventLogging().EventLogger;
}
}
public class EventLogging : IEventLogging
{
#region *-- Private Members --*
private ILogger<IEventLogging> _logger = null;
#endregion
public ILogger<IEventLogging> EventLogger { get { return this._logger; } }
public EventLogging()
{
EventLogSettings settings = new EventLogSettings();
settings.LogName = "Application";
settings.SourceName = "MeCore2";
settings.MachineName = ".";
ILoggerFactory loggerFactory = new LoggerFactory();
loggerFactory.AddProvider(new EventLogLoggerProvider(settings));
this._logger = loggerFactory.CreateLogger<IEventLogging>();
}
}
public interface IEventLogging
{
ILogger<IEventLogging> EventLogger { get; }
}
And in my HostBuilder the following:
.ConfigureServices(services => services.AddTransient(EventLoggingFactory.Create))
What I haven't considered and I'm still wrapping my head around are service LifeTimes. Using this approach the Ilogger is Transient, but is that the best way to implement it?
The final code block on this post has been a sufficient solution for my needs. With a little more effort I've been able to expand the features used to capture log data for viewing in Windows Event Viewer.
My Spring Boot Application is secured by Spring Security OAuth2. The userdata is stored in a SQL-database. I followed here royclarkson's Oauth protected REST service. This project works with Spring Data JPA. This works fine.
https://github.com/royclarkson/spring-rest-service-oauth
But now I want to implement my Neo4J Configuration to get data from my Neo4J-Database via Neo4J-JDBC (JDBC-template). Here I followed this GitHub project:
https://github.com/neo4j-examples/movies-java-spring-boot-jdbc
As a standalone application it works, but if I put this two projects togehter, I get this Exception:
HibernateJpaAutoConfiguration.class]: Invocation of init method failed;
nested exception is org.hibernate.HibernateException:
Unable to determine Dialect to use [name=Neo4j, majorVersion=3];
user must register resolver or explicitly set 'hibernate.dialect'
My Neo4jConfig.java looks like this:
#Configuration
public class Neo4jConfig {
//NEO4J Server Implementation via JDBC
private static final String NEO4J_URL = System.getProperty("NEO4J_URL","jdbc:neo4j://localhost:7474");
private static final String NEO4J_USER = System.getProperty("NEO4J_USER","neo4j");
private static final String NEO4J_PASSWORD = System.getProperty("NEO4J_PASSWORD","neo4j");
#Bean
public DataSource dataSource() {
return new DriverManagerDataSource(NEO4J_URL, NEO4J_USER, NEO4J_PASSWORD);
}
public Neo4jConfig(){
}
public String getNeo4JURL(){
return NEO4J_URL;
}
}
TripController.java
import hello.data.Trip;
#RestController
public class TripController {
#Autowired
JdbcTemplate template;
public static final RowMapper<Trip> TRIP_ROW_MAPPER = new RowMapper<Trip>() {
public Trip mapRow(ResultSet rs, int rowNum) throws SQLException {
return new Trip(rs.getString("tripname"),rs.getInt("slots"), rs.getInt("to_date"), rs.getInt("from_date"));
}
};
String SEARCH_TRIPS_QUERY =
" MATCH (t:Trip)\n" +
" RETURN t.tripname as tripname, t.slots as slots, t.to_date as to_date, t.from_date as from_date";
#RequestMapping(path = "/alltrips", method = RequestMethod.GET)
public List<Trip> alltrips() {
return template.query(SEARCH_TRIPS_QUERY, TRIP_ROW_MAPPER);
}
}
I hope you guys understand my question. I know, I am a really newone at Spring, but I hope anyone can help me :)
This is happening because hibernate does not find any dialect for Neo4J as Neo4j is not RDBMS database and dialect is not provided by default. You can use Hibernate OGM (search and include it in pom.xml), and then use following configuration to configure Entitymanager and Transaction manager
#Configuration
#EnableJpaRepositories(basePackages = {
"your repository packages" }, entityManagerFactoryRef = "n4jEntityManager", transactionManagerRef = "n4jTxnManager")
public class DatabaseConfiguration {
#Bean(name = "n4jEntityManager")
public LocalContainerEntityManagerFactoryBean entityManager() {
Map<String, Object> properties = new HashMap<String, Object>();
properties.put("javax.persistence.transactionType", "resource_local");
properties.put("hibernate.ogm.datastore.provider","neo4j");
properties.put("hibernate.ogm.datastore.host","localhost");
properties.put("hibernate.ogm.datastore.port","7474");
properties.put("hibernate.ogm.datastore.database", "your database");
properties.put("hibernate.ogm.datastore.create_database", "true or false");
LocalContainerEntityManagerFactoryBean entityManager = new LocalContainerEntityManagerFactoryBean();
entityManager.setPackagesToScan("your domain packages");
entityManager.setPersistenceUnitName("n4jPU");
entityManager.setJpaPropertyMap(properties);
entityManager.setPersistenceProviderClass(HibernateOgmPersistence.class);
return entityManager;
}
#Bean(name = "n4jTxnManager")
public PlatformTransactionManager txnManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(mongoEntityManager().getObject());
return transactionManager;
}
}
But I suggest, to remove Hibernate altogether if you are not going to use RDBMS and will only be using Neo4j. Spring data has good support for NoSQL databases and Entities can be defined using annotations like #NodeEntity and #GraphId
Using the following dependencies (Gradle):
org.glassfish.jersey.containers:jersey-container-servlet:2.22.2
org.eclipse.jetty:jetty-servlet:9.3.2.v20150730
I have an embedded Jetty server, with a Jersey servlet container... something like this ...
package mypkg.rest.jersey;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.glassfish.jersey.server.ServerProperties;
import org.glassfish.jersey.servlet.ServletContainer;
import se.transmode.tnm.alarm.api.AlarmRetrieval;
import mypkg.rest.RestServer;
import mypkg.rest.jersey.serviceImpl.ModelAdapter;
public class JerseyBasedRestServer implements RestServer {
public static final int INITIALIZE_ON_USE = 0;
private Server server;
private final ServletContextHandler context;
private final ServletHolder servlet;
private final ModelAdapter modelAdapter;
public JerseyBasedRestServer(BusinessObjects businessObjects) {
this.modelAdapter = new ModelAdapter(businessObjects); //I want this instance to somehow be available for my ServletContainer to use.
context = new ServletContextHandler(ServletContextHandler.SESSIONS);
servlet = context.addServlet(ServletContainer.class, "/*");
servlet.setInitOrder(INITIALIZE_ON_USE);
servlet.setInitParameter(ServerProperties.PROVIDER_PACKAGES, "mypackage.jersey.generated.api.service");
servlet.setInitParameter(ServerProperties.MEDIA_TYPE_MAPPINGS, "json : application/json");
context.setContextPath("/");
}
private void startServlet() {
try {
servlet.start();
servlet.initialize();
} catch (Exception e) {
log.error("Failed to initialize servlet. {}", e.getMessage());
}
}
#Override
public void init(int port) {
server = new Server(port);
server.setHandler(context);
try {
server.start();
server.join();
startServlet();
} catch (Exception e) {
log.error("Failed to start jetty server for rest interface");
} finally {
server.destroy();
}
}
The Jersey Container will run server code and model generated using the Swagger code-gen tool
https://github.com/swagger-api/swagger-codegen#getting-started
which delivers the generated model, JacksonJsonProvider, and a RestApi class:
package mypackage.jersey.generated.api.service
Path("/")
public class RestApi {
private final RestApiService delegate = new RestApiServiceImpl(); //Integration point of the generated code
#GET
#Path("/list/")
#Consumes({ "application/json" })
#Produces({ "application/json" })
public Response retrieveAlarmList(#Context SecurityContext securityContext) throws NotFoundException {
return delegate.retrieveAlarmList(securityContext);
}
}
To integrate the generated code we are left to implement RestApiServiceImpl ourselves.
The ModelAdapter's job is to convert our business objects to the generated rest model.
So the question is how do I make the instance of the adapter of our business objects, in this case ModelAdapter, which lies outside the context of the Jersey servlet context, available to the RestApi class, or rather the RestApiServiceImpl?
I kind of understood from reading the past 24 hours that I need to use some sort of Context Dependency Injection either through Jetty, Jersey, or some other library (Weld seems to appear a lot), and have tried various combinations of #Inject, #Context, etc etc, but have come to the conclusion that I have no clue what I am actually doing... I'm not even sure I understand enough about the situation to phrase my question correctly.
More info can be made available on request.
Any help is appreciated.
EDIT: added a link here to https://github.com/englishbobster/JersetAndJetty
using #peeskillets suggestions, but still not working.
First thing you need to make DI work, is an AbstractBinder. This is where you will make your objects available to be injected.
class Binder extends AbstractBinder {
#Override
protected void configure() {
bind(modelAdapter).to(ModelAdapter.class);
}
}
Then you need to register the binder with Jersey. The easiest way is to register in Jersey's ResourceConfig. In your case, you are not using one. You are configuring everything in the "web.xml". For that, you should take a look at this post.
If you want to change your configuration to use a ResourceConfig, which personally I'd rather use, you can do this
package com.some.pkg;
public class JerseyConfig extends ResourceConfig {
public JerseyConfig() {
packages("mypackage.jersey.generated.api.service");
property(ServerProperties.MEDIA_TYPE_MAPPINGS, "json : application/json");
register(new Binder());
}
}
Then to configure it with Jetty, you can do
servlet.setInitParameter(ServletProperties.JAXRS_APPLICATION_CLASS,
"com.some.pkg.JerseyConfig");
Now you can get rid of those other two init-params, as you are configuring it inside the ResourceConfig.
Another way, without any init-params, is to do
ResourceConfig config = new JerseyConfig();
ServletHolder jerseyServlet = new ServletHolder(ServletContainer(config));
context.addServlet(jerseyServlet, "/*");
See full example of last code snippet, here.
Now you can just inject the ModelAdapter pretty much anywhere within Jersey
In a field
#Inject
private ModelAdapter adapter;
Or in a contructor
#Inject
public RestApi(ModelAdapter adapter) {
this.adapter = adapter;
}
Or method parameter
#GET
public Response get(#Context ModelAdapter adapter) {}
I need to set up logs in my asp.net application. It's easy to add output to the console, but I need to configure it in Azure. I don't know how to do it. I need to log all information that occurs with my app into some file and read it.
The ILoggerFactory allows an app to use any implementation of ILogger and ILoggerProvider.
For details on how to implement the interfaces properly, look at the framework's ConsoleLogger and ConsoleLoggerProvider. See also the ASP.NET Core documentation on logging.
Here is a minimal example of a custom ILogger to get started. This is not production code, rather, it demos enough technical depth either to write your own ILogger or to use one from the community.
project.json
"dependencies": {
"Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
"Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final"
}
MyLoggingProvider.cs
namespace LoggingExample
{
using Microsoft.Extensions.Logging;
public class MyLoggingProvider : ILoggerProvider
{
public ILogger CreateLogger(string categoryName)
{
return new MyLogger();
}
public void Dispose()
{
// TODO Cleanup
}
}
}
MyLogger.cs
In Azure you will want to write to somewhere other than C:/temp/some-guid.txt. This is enough to get you started, though, with writing your own simple logger.
namespace LoggingExample
{
using System;
using Microsoft.Extensions.Logging;
public class MyLogger : ILogger
{
public void Log(LogLevel logLevel, int eventId, object state,
Exception exception, Func<object, Exception, string> formatter)
{
var builder = new StringBuilder();
if (formatter != null) {
builder.AppendLine(formatter(state, exception));
}
var values = state as ILogValues;
if (values != null) {
foreach (var v in values.GetValues()) {
builder.AppendLine(v.Key + ":" + v.Value);
}
}
var logPath = string.Format("C:/temp/{0}.txt", Guid.NewGuid());
File.WriteAllText(logPath, builder.ToString());
}
public bool IsEnabled(LogLevel logLevel) {
return true;
}
public IDisposable BeginScopeImpl(object state) {
return null;
}
}
}
Startup.cs
Now in startup you can use add your logger via loggerFactory.AddProvider(new MyLoggingProvider()). Every call to the ILogger will now log with your provider.
namespace LoggingExample
{
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.Logging;
public class Startup
{
public void Configure(
IApplicationBuilder app,
ILoggerFactory loggerFactory)
{
loggerFactory
.AddConsole(minLevel: LogLevel.Verbose)
.AddProvider(new MyLoggingProvider());
app.Run(async (context) =>
{
var logger = loggerFactory.CreateLogger("CatchAll");
logger.LogInformation("Hello logger!");
await context.Response.WriteAsync("Hello world!");
});
}
}
}
MyController.cs
Anywhere that supports dependency injection can now receive an ILogger that will log to all of the providers that we registered in the Startup.Configure method.
namespace LoggingExample
{
using Microsoft.AspNet.Mvc;
using Microsoft.Extensions.Logging;
public class MyController : Controller
{
public MyController(ILogger logger)
{
logger.LogInformation("Logging from my controller");
}
}
}
Log4Net
Use Log4Net. Its a common framework for logging that everyone who follows up on your code will understand, and it lets you do things like attach a new log "destination" on the fly just by editing your config file. It already covers most of the things you'll want to do (like create a separate file for each "day"), and most of the log mining tools out there will be able to read the files l4n creates.
Setting it Up
There are tutorials online for how to get started, but they basically require a few simple steps:
Download the Log4Net nuget package.
Adjust the log settings in your web.config file
Create a static instance of the logger object
Log Stuff wherever you need to. If you decide you want your logger to write to a file, it will. If you add a database writer, it will write to the db too. Want your log entries to show up in console, just add that logger in your default (debug) config.
Once you get it setup, logging is as simple as this code:
...
} catch(SystemException ex) {
logger.Error("This error was thrown by the XXX routine", ex);
}
Hope that's helpful.
Edit: Config File + Core
As #auga points out in his oh-so-helpful comment, config for ASP.Net 5 may require you to read carefully the link I added under step #2 above (configuring your logger). Instead of re-writing someone else's blog post, I'll just link to the article I used to set this up in our ASP.NET 5 environment. Works really well.
If you're reading this post to learn (instead of skimming it to critique), I'd suggest following the links...
Is there way to configure the objects from inside the code rather than configuring it in xml or app.config file.
On the spring.net homepage, you'll find an announcement for the CodeConfig project. CodeConfig allows you to create spring configuration from code, like for instance:
[Configuration]
public class MovieFinderConfiguration
{
[Definition]
public virtual MovieLister MyMovieLister()
{
MovieLister movieLister = new MovieLister();
movieLister.MovieFinder = FileBasedMovieFinder();
return movieLister;
}
[Definition]
public virtual IMovieFinder FileBasedMovieFinder()
{
return new ColonDelimitedMovieFinder(new FileInfo("movies.txt"));
}
}
You can use this together with any xml configuration you might already have.