Develop Reference

Showing an image on broswer using #ResponseBody in spring boot

Hello i have this code to display an immage saved on my filesystem on broswer:
#GetMapping(value = "/prova/img/{id}", produces = MediaType.IMAGE_JPEG_VALUE)
public #ResponseBody byte[] getImageWithMediaType(#PathVariable String id) throws IOException {
String path = uploadFolderPath +"/"+ id;
if(Files.exists(Paths.get(path)) && !Files.isDirectory(Paths.get(path))) {
InputStream in = getClass().getResourceAsStream(path);
return IOUtils.toByteArray(in);
}else {
return null; //this is just for example it should never get here
}
I'm getting this error:
Cannot invoke "java.io.InputStream.read(byte[])" because "input" is null
Any suggestion?

Your code first tests that your input exists (as a File) and is not a directory, then you go ahead and try to read it as a resource from the class path using getClass().getResourceAsStream(path). This is usually not what you want.
Try instead InputStream in = new FileInputStream(path);.
Like this:
if (Files.exists(Paths.get(path)) && !Files.isDirectory(Paths.get(path))) {
InputStream in = new FileInputStream(path);
return IOUtils.toByteArray(in);
}
PS: If you are on Java 9 or later, you don't need the IOUtils dependency, simply use readAllBytes. And as you already use Files and Path, we can clean up the code a bit like this:
Path filePath = Paths.get(path);
if (Files.exists(filePath) && !Files.isDirectory(filePath)) {
InputStream in = Files.newInputStream(filePath, StandardOpenOption.READ);
return in.readAllBytes();
}

Unable to attach file to issue in jira via rest api Java

I want to attach multiple files to issue. I'm able to create issue successfully however i am facing problem in attaching documents after creating issue. I have referred to this link SOLVED: attach a file using REST from scriptrunner
I am getting 404 error even though issue exists and also user has all the permissions.
File fileToUpload = new File("D:\\dummy.txt");
InputStream in = null;
try {
in = new FileInputStream(fileToUpload);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
HttpResponse < String > response3 = Unirest
.post("https://.../rest/api/2/issue/test-85/attachments")
.basicAuth(username, password).field("file", in , "dummy.txt")
.asString();
System.out.println(response3.getStatus());
here test-85 is a issueKey value.
And i am using open-unirest-java-3.3.06.jar. Is the way i am attaching documents is correct?

I am not sure how open-unirest manages its fields, maybe it tries to put them as json field, rather than post content.
I've been using Rcarz's Jira client. It's a little bit outdated but it still works.
Maybe looking at its code will help you, or you can just use it directly.
The Issue class:
public JSON addAttachment(File file) throws JiraException {
try {
return restclient.post(getRestUri(key) + "/attachments", file);
} catch (Exception ex) {
throw new JiraException("Failed add attachment to issue " + key, ex);
}
}
And in RestClient class:
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
public JSON post(String path, File file) throws RestException, IOException, URISyntaxException {
return request(new HttpPost(buildURI(path)), file);
}
private JSON request(HttpEntityEnclosingRequestBase req, File file) throws RestException, IOException {
if (file != null) {
File fileUpload = file;
req.setHeader("X-Atlassian-Token", "nocheck");
MultipartEntity ent = new MultipartEntity();
ent.addPart("file", new FileBody(fileUpload));
req.setEntity(ent);
}
return request(req);
}
So I'm not sure why you're getting a 404, Jira is sometime fuzzy and not really clear about its error, try printing the full error, or checking Jira's log if you can. Maybe it's just the "X-Atlassian-Token", "nocheck", try adding it.

Error : Failed to load PDF document using google cloud StorageOptions for SignUrl

I am trying to get PDF document from Web API using google cloud SignUrl, and want to show in app. Getting "Error : Failed to load PDF document".
I follow for signurl :- https://cloud.google.com/storage/docs/access-control/signed-urls
This below code working fine for images file.
I try commented in code.
Its code getting signurl for all files and pdf file also, but I am unable to figure out that how is it get pdf file for view?
Please go through my code:
ControllerClass :-
class ControllerClass{
public Result show(String fileName) throws IOException {
return redirect(mModelService.getSignedUrl(fileName));
// -- TRY other way to get pdf file.
//return redirect(mModelService.getSignedUrl(userId,fileName));
// .withHeader("Content-Type","application/pdf");
// .as("application/octet-stream");
}
}
Get Signed Url :-
public String getSignedUrl(String fileName) throws IOException {
String remotePath = filePath(fileName);
BlobId blobId = BlobId.of("gcsBucket", remotePath);
Blob blob = getStorage().get(blobId);
if(blob != null && blob.exists()){
URL url = blob.signUrl(ttlMinutes, TimeUnit.MINUTES, SignUrlOption.httpMethod(HttpMethod.GET)
);
return url.toString();
}
Get Storage :-
public com.google.cloud.storage.Storage getStorage() {
if(storage == null) {
synchronized (lock) {
if(storage == null) {
storage = StorageOptions.getDefaultInstance().getService();
}
}
}
return storage;
}
// -- TRY other way to get pdf file.
public String getSignedUrl(String fileName) throws IOException {
BlobId blobId = BlobId.of(gcsBucket, remotePath);
BlobInfo blobInfo = BlobInfo.newBuilder(blobId)
/*.setContentType("application/doc")*/
/*.setContentType("application/pdf")*/
/*.setContentType("application/octet-stream")*/
.build();
URL url = cloudStorageFactory.getStorage().signUrl(blobInfo,ttlMinutes, TimeUnit.MINUTES, SignUrlOption.httpMethod(HttpMethod.GET)
// ,SignUrlOption.withContentType()
);
return url.toString();
}

IllegalArgumentException: Jetty ALPN/NPN has not been properly configured

I'm trying to use google vision in google api, however I have the following problem:
jun 07, 2017 8:50:00 AM io.grpc.internal.ChannelExecutor drain
ADVERTÊNCIA: Runnable threw exception in ChannelExecutor
java.lang.IllegalArgumentException: Jetty ALPN/NPN has not been
properly configured. at
io.grpc.netty.GrpcSslContexts.selectApplicationProtocolConfig(GrpcSslContexts.java:174)
at io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:151)
at io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:139)
at io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:109)
at
io.grpc.netty.NettyChannelBuilder.createProtocolNegotiatorByType(NettyChannelBuilder.java:335)
at
io.grpc.netty.NettyChannelBuilder.createProtocolNegotiator(NettyChannelBuilder.java:308)
at
io.grpc.netty.NettyChannelBuilder$NettyTransportFactory$DynamicNettyTransportParams.getProtocolNegotiator(NettyChannelBuilder.java:499)
at
io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.newClientTransport(NettyChannelBuilder.java:448)
at
io.grpc.internal.CallCredentialsApplyingTransportFactory.newClientTransport(CallCredentialsApplyingTransportFactory.java:61)
at
io.grpc.internal.InternalSubchannel.startNewTransport(InternalSubchannel.java:209)
at
io.grpc.internal.InternalSubchannel.obtainActiveTransport(InternalSubchannel.java:186)
at
io.grpc.internal.ManagedChannelImpl$SubchannelImplImpl.obtainActiveTransport(ManagedChannelImpl.java:806)
at
io.grpc.internal.GrpcUtil.getTransportFromPickResult(GrpcUtil.java:568)
at
io.grpc.internal.DelayedClientTransport.reprocess(DelayedClientTransport.java:296)
at
io.grpc.internal.ManagedChannelImpl$LbHelperImpl$5.run(ManagedChannelImpl.java:724)
at io.grpc.internal.ChannelExecutor.drain(ChannelExecutor.java:87)
at
io.grpc.internal.ManagedChannelImpl$LbHelperImpl.runSerialized(ManagedChannelImpl.java:715)
at
io.grpc.internal.ManagedChannelImpl$NameResolverListenerImpl.onUpdate(ManagedChannelImpl.java:752)
at io.grpc.internal.DnsNameResolver$1.run(DnsNameResolver.java:174)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
I'm trying to run the api's own sample code, below:
public class QuickstartSample {
public static void main(String... args) throws Exception {
// Instantiates a client
ImageAnnotatorClient vision = ImageAnnotatorClient.create();
// The path to the image file to annotate
String fileName = "./resources/wakeupcat.jpg";
// Reads the image file into memory
Path path = Paths.get(fileName);
byte[] data = Files.readAllBytes(path);
ByteString imgBytes = ByteString.copyFrom(data);
// Builds the image annotation request
List<AnnotateImageRequest> requests = new ArrayList<>();
Image img = Image.newBuilder().setContent(imgBytes).build();
Feature feat = Feature.newBuilder().setType(Type.LABEL_DETECTION).build();
AnnotateImageRequest request = AnnotateImageRequest.newBuilder().addFeatures(feat).setImage(img).build();
requests.add(request);
// Performs label detection on the image file
BatchAnnotateImagesResponse response = vision.batchAnnotateImages(requests);
List<AnnotateImageResponse> responses = response.getResponsesList();
for (AnnotateImageResponse res : responses) {
if (res.hasError()) {
System.out.printf("Error: %s\n", res.getError().getMessage());
return;
}
for (EntityAnnotation annotation : res.getLabelAnnotationsList()) {
annotation.getAllFields().forEach((k, v) -> System.out.printf("%s : %s\n", k, v.toString()));
}
}
}
}
I'm using the following dependencies:
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-vision</artifactId>
<version>v1-rev357-1.22.0</version>
</dependency>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-vision</artifactId>
<version>0.17.2-beta</version>
</dependency>
Has anyone ever had this problem?

I've actually discovered that to run the api, you must necessarily be in a web context and also be running the application on a Jetty server

gwt load generated class on server side

I have custom class generator. in this generator I creating two classes
public class WsRpcServerGenerator extends Generator{
#Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException {
JClassType classType;
try {
classType = context.getTypeOracle().getType(typeName);
SourceWriter src;
try {
// generating first file xxxAsync for client
src = generateMethod( classType, context, logger);
// generating second class for server side
SourceWriter src2 = generateMethodArgs( classType, context, logger);
if (src2!=null)
src2.commit(logger);
} catch (Exception e) {}
// returning first class for client
if (src == null)return typeName + "__AsyncWsRpcGenerated";
src.commit(logger);
return typeName + "__AsyncWsRpcGenerated";
} catch (NotFoundException e) {}
}
}
I use
TestObject obj = GWT.create(TestObject.class);
This is work. gwt generated two files. and first is loaded in client.
But I dont know how I can load second file on server side. If I refreshing project in eclipse for visibility generated classes, class is loaded with test=Class.forName("com.xxx.TestObject__ArgsGenerated");. but I not wont refreshing project, its library.
Thanks

What Im looking how do it default gwtRpc, gwtRpc save info about rpc serialization policy, what Im saving to class com.xxx.TestObject__ArgsGenerated, to plain text file to web directory.
So I must go this way.
in my generator I must create resource file, and put serialization policy there.
public class WsRpcServerGenerator extends Generator{
#Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException {
JClassType classType;
try {
classType = context.getTypeOracle().getType(typeName);
SourceWriter src;
try {
// generating first file xxxAsync for client
src = generateMethod( classType, context, logger);
// generating file to war directorz
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(baos, SerializationPolicyLoader.SERIALIZATION_POLICY_FILE_ENCODING);
TypeOracle oracle = context.getTypeOracle();
PrintWriter pw = new PrintWriter(osw);
// generate content here
pw.close();
byte[] serializationPolicyFileContents = baos.toByteArray();
String serializationPolicyName = Util.computeStrongName(serializationPolicyFileContents);
String serializationPolicyFileName = SerializationPolicyLoader.getSerializationPolicyFileName(serializationPolicyName);
OutputStream os = context.tryCreateResource(logger, serializationPolicyFileName);
if (os != null) {
os.write(serializationPolicyFileContents);
GeneratedResource resource = ctx.commitResource(logger, os);
}
// returning first class for client
if (src == null)return typeName + "__AsyncWsRpcGenerated";
src.commit(logger);
return typeName + "__AsyncWsRpcGenerated";
} catch (NotFoundException e | IOException e) {}
}
}
reading policy on server side
HttpServlet servlet;
String modulename; // sended from client GWT.getModuleBaseURL() reolacing host
Sending serialiyationpolicyid; // from generated xxxAsync
// Open the RPC resource file and read its contents.
InputStream is=servlet.getServletContext().getResourceAsStream(modulename+"/"+serialiyationpolicyid+".rpc");
// read policy

Im found the solution and make own compiler inspirated by original gwt ClassSourceFileComposerFactory
Generator source
usage
DynamicJavaFileObject composer = new DynamicJavaFileObject("com.xxx","ClassName");
composer.setSuperclass("superclass");
composer.addImport(GWT.class.getCanonicalName());
SourceWriter writer = composer.getSourceWriter();
writer.println("public String test(){return \"test\"}");
writer.commit(logger);
Now I can find class on server side
Class.forName("com.xxx.ClassName");