When using OCR tess4j using rest controller getting exception "java.lang.Error: Invalid memory access". Have also set the data path but as soon as i run the program it throws the above mentioned exception. And i have added the -Djava.jna.path with the libtesseract 302 dll. As withouth specifying the jna path i was getting "UnsatisfiedLinkError".
My Rest Controller Code
private Logger LOGGER = LoggerFactory.getLogger(Tess4jV1.class);
@Autowired
private ImageRepository repository;
@RequestMapping(value = "ocr/ping", method = RequestMethod.GET)
public Status ping() throws Exception {
return new Status("OK");
}
@RequestMapping(value = "ocr/v0.9/upload", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public Status doOcrFile(@RequestBody final Image image) throws Exception {
// File tmpFile = File.createTempFile("ocr_image",
// image.getExtension());
String uplodPath = "";
String selectedDocument = "";
String OriginalFilename = "ocr_image";
byte[] bytes = image.getImage();
uplodPath = System.getProperty("java.io.tmpdir");
uplodPath = uplodPath.replace("\\", "/");
if (!uplodPath.endsWith("/"))
uplodPath = uplodPath + "/";
uplodPath = uplodPath + "OCR_DMSIMGS";
File fath = new File(uplodPath);
if (!fath.exists())
fath.mkdirs();
String fileNme = "";
String recogniseStr = "";
try {
fileNme = System.nanoTime() + OriginalFilename;
uplodPath = uplodPath + "/" + fileNme + image.getExtension();
FileOutputStream dfos = new FileOutputStream(uplodPath);
dfos.write(bytes);
dfos.close();
} catch (Exception e) {
e.printStackTrace();
}
System.err.println(fath.getAbsolutePath());
//
// System.err.println(tmpFile.getAbsolutePath());
try {
// FileUtils.writeByteArrayToFile(tmpFile,
// Base64.decodeBase64(image.getImage()));
Tesseract tesseract = Tesseract.getInstance(); // JNA Interface
// Mapping
tesseract.setDatapath("C://Users//58181.INFOTECH//Downloads//Tess4J-1.3-src//Tess4J//tessdata");
ImageIO.scanForPlugins();
String imageText = tesseract.doOCR(new File(uplodPath));
LOGGER.debug("OCR Image Text = " + imageText);
} catch (Exception e) {
LOGGER.error("Exception while converting/uploading image: ", e);
throw new TesseractException();
} /*
* finally { tmpFile.delete(); }
*/
return new Status("success");
}
@RequestMapping(value = "ocr/v1/upload", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public Status doOcr(@RequestBody Image image) throws Exception {
try {
// FileUtils.writeByteArrayToFile(tmpFile,
// Base64.decodeBase64(image.getImage()));
ByteArrayInputStream bis = new ByteArrayInputStream(Base64.decodeBase64(image.getImage()));
Tesseract tesseract = Tesseract.getInstance(); // JNA Interface
// Mapping
String imageText = tesseract.doOCR(ImageIO.read(bis));
image.setText(imageText);
repository.save(image);
LOGGER.debug("OCR Result = " + imageText);
} catch (Exception e) {
LOGGER.error("TessearctException while converting/uploading image: ", e);
throw new TesseractException();
}
return new Status("success");
}
@RequestMapping(value = "ocr/v1/images/users/{userId}", method = RequestMethod.GET, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public List<Image> getUserImages(@PathVariable String userId) throws Exception {
List<Image> userImages = new ArrayList<>();
try {
userImages = repository.findByUserId(userId);
} catch (Exception e) {
LOGGER.error("Exception occurred finding image for userId: {} ", userId, e);
throw new Exception();
}
return userImages;
}
Exception:
Adding paths from jna.library.path: C:\Users\58181.INFOTECH\Downloads\Tess4J-1.3-src\Tess4J\lib\win32-x86-64
Trying C:\Users\58181.INFOTECH\Downloads\Tess4J-1.3-src\Tess4J\lib\win32-x86-64\libtesseract302.dll
Found library 'libtesseract302' at C:\Users\58181.INFOTECH\Downloads\Tess4J-1.3-src\Tess4J\lib\win32-x86-64\libtesseract302.dll
9226 [http-nio-8080-exec-2] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.Error: Invalid memory access] with root cause
java.lang.Error: Invalid memory access
at net.sourceforge.tess4j.TessAPI1.TessBaseAPIInit2(Native Method)
at net.sourceforge.tess4j.Tesseract1.init(Tesseract1.java:274)
at net.sourceforge.tess4j.Tesseract1.doOCR(Tesseract1.java:209)
at net.sourceforge.tess4j.Tesseract1.doOCR(Tesseract1.java:158)
at net.sourceforge.tess4j.Tesseract1.doOCR(Tesseract1.java:142)
at com.tess4j.rest.OcrRestController.doOcrFile(OcrRestController.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Invalid memory access for Tess4J usually means incorrect datapath, which should be set to the parent folder of tessdata folder, such as:
tesseract.setDatapath("C:/Users/58181.INFOTECH/Downloads/Tess4J-1.3-src/Tess4J/");
Note the double slashes should be double backslashes or single slashes.