I'm building a JHipster microservice application, consisting of Microservice, Registry and Gateway (React).
In the Microservice application I can use the application.yml / ApplicatioProperties.java to add properties (such as API keys) which may change between environments (Dev, Prod etc).
My question is, can I do the same thing on the React front-end? This is a Spring application so the same application.yml and ApplicationProperties.java are in place. Does anyone have a code example of surfacing custom properties to the UI?
There's an AuthInfoResource that takes properties and makes them available at an /api/auth-info endpoint. You could so something similar to expose configuration properties to your React app.
package <%= packageName %>.web.rest;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Resource to return information about OIDC properties
*/
#RestController
#RequestMapping("/api")
public class AuthInfoResource {
#Value("${spring.security.oauth2.client.provider.oidc.issuer-uri:}")
private String issuer;
#Value("${spring.security.oauth2.client.registration.oidc.client-id:}")
private String clientId;
#GetMapping("/auth-info")
public AuthInfoVM getAuthInfo() {
return new AuthInfoVM(issuer, clientId);
}
class AuthInfoVM {
private String issuer;
private String clientId;
AuthInfoVM(String issuer, String clientId) {
this.issuer = issuer;
this.clientId = clientId;
}
public String getIssuer() {
return this.issuer;
}
public void setIssuer(String issuer) {
this.issuer = issuer;
}
public String getClientId() {
return clientId;
}
public void setClientId(String clientId) {
this.clientId = clientId;
}
}
}
Related
localhost:9000 is opening fine on the browser. And if I navigate to a link from the menu like localhost:9000/about, it is working fine.
But if I hit localhost:9000/about directly without going to localhost:9000 then nothing happens on the local and if I do the same on server, following error is produced:
Whitelabel Error Page This application has no explicit mapping for
/error, so you are seeing this as a fallback.
Mon Feb 12 14:09:05 IST 2018 There was an unexpected error (type=Not
Found, status=404). No message available
Please help!!
This is happening because in your application you have not defined what your application should do when it will get url request localhost:9000.
For every Request mapping you need to define the operation you want to perform. In your case for localhost:9000 you have to write what you want to do as you have done for local:9000/about.
#RequestMapping("")
#ResponseBody
Function_For_HandlingRequest{}
When you hit http://localhost:9090/about directly, SpringBoot redirect To a /login.html.
So, Redirect every page to index.html .
https://github.com/geowarin/boot-react/blob/master/backend/src/main/java/react/config/SinglePageAppConfig.java
The WebMvcConfigurer interface, starting with Spring 5, contains default implementations for all its methods. As a result, the abstract adapter (WebMvcConfigurerAdapter) class was marked as deprecated.
package your.package.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.resource.ResourceResolver;
import org.springframework.web.servlet.resource.ResourceResolverChain;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
/**
* Redirects every page to index.html
* Used to handle the router
*/
#Configuration
public class SinglePageAppConfig implements WebMvcConfigurer {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/**")
.addResourceLocations("classpath:/static/")
.resourceChain(false)
.addResolver(new PushStateResourceResolver());
}
private class PushStateResourceResolver implements ResourceResolver {
private Resource index = new ClassPathResource("/static/index.html");
private List<String> handledExtensions = Arrays.asList("html", "js", "json", "csv", "css", "png", "svg", "eot", "ttf", "woff", "appcache", "jpg", "jpeg", "gif", "ico");
private List<String> ignoredPaths = Arrays.asList("api");
#Override
public Resource resolveResource(HttpServletRequest request, String requestPath, List<? extends Resource> locations, ResourceResolverChain chain) {
return resolve(requestPath, locations);
}
#Override
public String resolveUrlPath(String resourcePath, List<? extends Resource> locations, ResourceResolverChain chain) {
Resource resolvedResource = resolve(resourcePath, locations);
if (resolvedResource == null) {
return null;
}
try {
return resolvedResource.getURL().toString();
} catch (IOException e) {
return resolvedResource.getFilename();
}
}
private Resource resolve(String requestPath, List<? extends Resource> locations) {
if (isIgnored(requestPath)) {
return null;
}
if (isHandled(requestPath)) {
return locations.stream()
.map(loc -> createRelative(loc, requestPath))
.filter(resource -> resource != null && resource.exists())
.findFirst()
.orElseGet(null);
}
return index;
}
private Resource createRelative(Resource resource, String relativePath) {
try {
return resource.createRelative(relativePath);
} catch (IOException e) {
return null;
}
}
private boolean isIgnored(String path) {
return ignoredPaths.contains(path);
}
private boolean isHandled(String path) {
String extension = StringUtils.getFilenameExtension(path);
return handledExtensions.stream().anyMatch(ext -> ext.equals(extension));
}
}
}
in Application
#Bean
public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer() {
return factory -> {
ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/index.html");
factory.addErrorPages(error404Page);
};
}
enter image description here
I'm trying to learn EJB3,
I created an EJB project with just a bean class:
package com;
import javax.ejb.Local;
import javax.ejb.Stateless;
#Stateless
#LocalBean
public class MyBean {
public MyBean() {
// TODO Auto-generated constructor stub
}
public String getMessage(){
return "Hello";
};
}
I deployed this project on Jboss 6 , then i create a Java project (adding in the build path the ejbProject above and Jboss-client.jar to make RMI calls).
for testing , this is the class i created:
import javax.ejb.EJB;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import com.MyBean;
public class LanceProgram {
// #EJB
//public static MyBean mybean;
public static void main(String[] args) {
Context ctx;
try {
ctx = new InitialContext();
MyBean exampleBean = (MyBean) ctx.lookup("MyBean");
System.out.println(exampleBean.getMessage());
} catch (NamingException e) {
e.printStackTrace();
}
}
}
Normally, when running this, i should have a reference to MyBean,but it's null and i have this error message (using JNDI lookup):
Exception in thread "main" java.lang.ClassCastException: org.jnp.interfaces.NamingContext cannot be cast to com.MyBean
at LanceProgram.main(LanceProgram.java:17)
While with an EJB injection i have a NullPointerException !
this i my jndi.properties file specifications:
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=localhost:1099
java.naming.factory.url.pkgs=org.jboss.ejb.client.naming
I'm trying to make a call to a bean which doesn't implements an interface.
Thanks for helping
The environment CXF2.2.6 and Spring 2.5. On Startup JBOSS I need to read CXF properties and change End point details. From basic reading it gives me the idea that CXF Service Info class (org.apache.cxf.service.model.ServiceInfo) handle bindings,endpoints,messages,schemas and so on.
I can Extend CXFServlet and create my own custom servlet. Please advise me the way I can give my own details to Endpoint in startup and override what is given in Spring.xml
The below Spring bean should do what you wanted. Why do you want to override ServiceInfo class ? Any particular reason ?
import org.apache.cxf.Bus;
import org.apache.cxf.jaxws.EndpointImpl;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.ServletContextAware;
public class CXFConfig implements InitializingBean{
#Autowired
Bus cxfBus;
#Override
public void afterPropertiesSet() throws Exception {
EndpointImpl endpoint = new EndpointImpl(cxfBus, new GdsAutomationServiceProviderImpl());
endpoint.setAddress("/public/api/service/v1");//WSDL URL
endpoint.setPublishedEndpointUrl(getEndPointAddress());
endpoint.publish();
}
public Bus getCxfBus() {
return cxfBus;
}
public void setCxfBus(Bus cxfBus) {
this.cxfBus = cxfBus;
}
public String getEndPointAddress() {
// Soap address location you need to define here
return "address"
}
#Override
public void setServletContext(ServletContext context) {
context.getServerInfo();
}
}
I am not able to inject a SLSB in another SLSB. Actually created 3 projects
1) created a EJB project with an MDB
2) created a EJB project with a stateless session bean for posting the message
3) created a EJB project with a stateless session bean for injecting the above session bean
But while injecting I am not able to inject the EJB it is returning null
the code is as below
1) MDB:
#MessageDriven(
activationConfig = {
#ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
#ActivationConfigProperty(propertyName = "destination", propertyValue = "activemq/queue/TestQueue"),
#ActivationConfigProperty(propertyName="acknowledgeMode", propertyValue="Auto-acknowledge")
})
#ResourceAdapter("activemq-ra.rar")
public class ConsumerMDB implements MessageListener {
public void onMessage(Message message) {
try {
System.out.println("Queue: Received a TextMessage at " + new Date());
TextMessage msg = (TextMessage) message;
System.out.println("Message is : " + msg.getText());
} catch (JMSException e) {
e.printStackTrace();
}
}
}
2) Session Bean 1
package com.springboard.session;
import javax.annotation.Resource;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.jms.JMSException;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.TextMessage;
#Stateless
#LocalBean
public class ProducerSession implements ProducerSessionLocal {
#Resource(mappedName="java:jboss/activemq/QueueConnectionFactory")
public static QueueConnectionFactory factory;
#Resource(mappedName = "java:jboss/activemq/queue/TestQueue")
public static Queue queue;
#Override
public void sendMessage(String msg) {
System.out.println("****************Entering into method********************");
try {
System.out.println(queue.getQueueName());
QueueConnection qConnection = factory.createQueueConnection();
QueueSession qSession = qConnection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);
TextMessage message = qSession.createTextMessage();
message.setText(msg);
QueueSender qSender = qSession.createSender(queue);
qSender.send(message);
qSender.close();
qSession.close();
qConnection.close();
} catch (JMSException e) {
e.printStackTrace();
}
System.out.println("****************Exiting into method********************");
}
}
and the interface is
package com.springboard.session;
import javax.ejb.Local;
#Local
public interface ProducerSessionLocal {
public void sendMessage(String msg);
}
3) Second session bean to inject the first session
#Stateless
public class TestProducerLocalBean implements TestProducerLocalBeanLocal {
#EJB(mappedName = "java:global/ProducerSessionActiveMQ/ProducerSession!com.springboard.session.ProducerSessionLocal")
public ProducerSessionLocal producer;
public TestProducerLocalBean() {
System.out.println("*************Testing Producer****************");
if(producer!=null){
producer.sendMessage("This Message is from SessionBean to Session Bean to MDB");
}
else{
System.out.println("EJB is null");
}
System.out.println("**********End************************");
}
#Override
public void messageSend(String msg) {
// TODO Auto-generated method stub
}
and for testing purpose used a class
import javax.ejb.EJB;
import com.springboard.session.test.TestProducerLocalBean;
public class testEJB {
#EJB
public static TestProducerLocalBean local =new TestProducerLocalBean();
public static void main(String[] args) {
}
}
At producer EJB always retuns null. With using servlet to inject ProducerSession i am able to do it. but injecting with another EJB i not able to get it.
Could any one please help me out what i am missing
Thanks in advance
It's incorrect to use initialization ... = new Xyz() when using injection because initialization of those fields is the responsibility of the container. You probably attempted that because you noticed that the field was null, and that's because injection (including #EJB) is not supported in the main class unless you use an application client container.
There is a "JRE Class White List" for the Google App Engine.
What I would really like is a "Black List" -- in other words, Java APIs that will not work on GAE. Does such a list exist? Have any developers run into problems with Java APIs on GAE?
It seems that they've taken more of a white-list approach: http://code.google.com/appengine/docs/java/jrewhitelist.html.
There is also more detail about the sandbox (what files it can access and so on) here: http://code.google.com/appengine/docs/java/runtime.html#The_Sandbox
The restrictions seem to be pretty intuitive (like restricted filesystem access, no JNI, etc).
I got a card advertising this service at Google I/O:
LTech AppEngine Compatibility Analyzer
Sounds like it might be of use to you. I have not tried it, if you do try it, please come back and comment. Thanks!
i use Servlet in my GAE project, however it is not in the whitelist even when it will work without any problem. In fact, Google mention how to use Servlet but it is not in the whitelist
import javax.servlet.http.*;
Mentioned here:
http://code.google.com/appengine/docs/java/runtime.html
but not included here:
http://code.google.com/appengine/docs/java/jrewhitelist.html
I love GAE (because the free quota) but the documentation is a mess.
I use IntelliJ and it mark as an error when the import not in the whitelist. However, it is possible to disable it.
I was looking for something when i came across this query and so thought to share the details on the black & white list of GAE(Google App Engine) so anyone getting such issue could address it properly. Details :-
appengine-agentruntime.jar has two instance variables as :-
private static Agent agent
private static Set<String> blackList
We getting blackList from agent & agent = AppEngineDevAgent.getAgent(). So if we check b) appengine-agent.jar we can find agent is Class<?> implClass = agentImplLoader.loadClass("com.google.appengine.tools.development.agent.impl.AgentImpl");
And then going to AgentImpl class i.e. c) appengine-agentimpl.jar we can
see blacklist variable getting populated at class load with the static initialization & it refers Whitelist for filtering the allowed classes.
static {
initBlackList();
}
public static Set<String> getBlackList() {
return blackList;
}
private static boolean isBlackListed(String className) {
Set<String> whiteList = WhiteList.getWhiteList();
return (!whiteList.contains(className))
&& (!className.startsWith("com.sun.xml.internal.bind."));
}
Finally can check d) appengine-tools-sdk-1.8.3.jar for list of all WhiteList classes.
Conclusion: As a hack in order to use any JRE class which do not belong to this WhiteList one need to play around either with the WhiteList or with the BlackList. A possible hack would be if you unjar the appengine-agentruntime.jar library & comment the content of reject method as
public static void reject(String className) {
/*throw new NoClassDefFoundError(className + " is a restricted class. Please see the Google " + " App Engine developer's guide for more details.");*/
}
And then again jar it and use in your project.Hope it helps.
-----------------------------------------------------------------------------
a) appengine-agentruntime.jar :- It holds the actual Runtime class which throws exception (from reject method) for classes which do not belong to above white list.
package com.google.appengine.tools.development.agent.runtime;
import com.google.appengine.tools.development.agent.AppEngineDevAgent;
import com.google.appengine.tools.development.agent.impl.Agent;
import com.google.apphosting.utils.clearcast.ClearCast;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT
public class Runtime {
private static Agent agent = (Agent) ClearCast.cast(
AppEngineDevAgent.getAgent(), Agent.class);
private static Set<String> blackList = agent.getBlackList();
public static ClassLoader checkParentClassLoader(ClassLoader loader) {
ClassLoader systemLoader = ClassLoader.getSystemClassLoader();
return (loader != null) && (loader != systemLoader) ? loader
: Runtime.class.getClassLoader();
}
public static void recordClassLoader(ClassLoader loader) {
agent.recordAppClassLoader(loader);
}
public static void reject(String className) {
throw new NoClassDefFoundError(className
+ " is a restricted class. Please see the Google "
+ " App Engine developer's guide for more details.");
}
private static boolean isBlackListed(Class klass) {
String className = klass.getName().replace('.', '/');
return blackList.contains(className);
}
// REMOVED OTHER METHODS TO KEEP IT SHORT
}
b) appengine-agent.jar :-
package com.google.appengine.tools.development.agent;
import com.google.apphosting.utils.clearcast.ClearCast;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT
public class AppEngineDevAgent {
private static final String AGENT_IMPL = "com.google.appengine.tools.development.agent.impl.AgentImpl";
private static final String AGENT_IMPL_JAR = "appengine-agentimpl.jar";
private static final Logger logger = Logger.getLogger(AppEngineDevAgent.class.getName());
private static Object impl;
public static void premain(String agentArgs, Instrumentation inst) {
URL agentImplLib = findAgentImplLib();
URLClassLoader agentImplLoader = new URLClassLoader(
new URL[] { agentImplLib }) {
protected PermissionCollection getPermissions(CodeSource codesource) {
PermissionCollection perms = super.getPermissions(codesource);
perms.add(new AllPermission());
return perms;
}
};
try {
Class<?> implClass = agentImplLoader
.loadClass("com.google.appengine.tools.development.agent.impl.AgentImpl");
impl = ((AgentImplStruct) ClearCast.staticCast(implClass,
AgentImplStruct.class)).getInstance();
AgentImplStruct agentImplStruct = (AgentImplStruct) ClearCast.cast(
impl, AgentImplStruct.class);
agentImplStruct.run(inst);
} catch (Exception e) {
logger.log(
Level.SEVERE,
"Unable to load the App Engine dev agent. Security restrictions will not be completely emulated.",
e);
}
}
public static Object getAgent() {
return impl;
}
//REMOVED OTHER METHODS TO KEEP IT SHORT
}
c) appengine-agentimpl.jar :-
package com.google.appengine.tools.development.agent.impl;
import com.google.apphosting.runtime.security.WhiteList;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT
public class BlackList {
private static final Logger logger = Logger.getLogger(BlackList.class.getName());
private static Set<String> blackList = new HashSet();
static {
initBlackList();
}
public static Set<String> getBlackList() {
return blackList;
}
private static boolean isBlackListed(String className) {
Set<String> whiteList = WhiteList.getWhiteList();
return (!whiteList.contains(className))
&& (!className.startsWith("com.sun.xml.internal.bind."));
}
private static void initBlackList() {
Set<File> jreJars = getCurrentJreJars();
for (File f : jreJars) {
JarFile jarFile = null;
try {
jarFile = new JarFile(f);
} catch (IOException e) {
logger.log(
Level.SEVERE,
"Unable to read a jre library while constructing the blacklist. Security restrictions may not be entirely emulated. "
+ f.getAbsolutePath());
}
continue;
Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry entry = (JarEntry) entries.nextElement();
String entryName = entry.getName();
if (entryName.endsWith(".class")) {
String className = entryName.replace('/', '.').substring(0,
entryName.length() - ".class".length());
if (isBlackListed(className)) {
blackList.add(className.replace('.', '/'));
}
}
}
}
blackList = Collections.unmodifiableSet(blackList);
}
private static Set<File> getCurrentJreJars() {
return getJreJars(System.getProperty("java.home"));
}
//REMOVED OTHER METHODS TO KEEP IT SHORT
}
d) appengine-tools-sdk-1.8.3.jar :- It has a class called WhiteList which includes all allowed JRE classes.
package com.google.apphosting.runtime.security;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class WhiteList {
private static Set<String> whiteList = new HashSet(
Arrays.asList(new String[] {
"java.beans.Transient",
"java.lang.BootstrapMethodError",
"java.lang.Character$UnicodeScript",
"java.lang.ClassValue",
"java.lang.SafeVarargs",
//Removed other classes to keep this article short
"java.net.URLClassLoader",
"java.security.SecureClassLoader",
"sun.net.spi.nameservice.NameService" }));
public static Set<String> getWhiteList() {
return whiteList;
}
}