Running tess4j (tessreact java wrapper) under Linux

Question

On linux server tesseract 3.0.2 libraries were correctly installed:

[root@XXX as]# rpm -qa | grep ".*tess.*"
tesseract-3.02-alt1.r723

When trying to run tess4j wrapper, got this exception:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'TessBaseAPICreate': /usr/lib64/libtesseract.so.3.0.2: undefined symbol: TessBaseAPICreate
        at com.sun.jna.Function.<init>(Function.java:208)
        at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:536)
        at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:513)
        at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:499)
        at com.sun.jna.Library$Handler.invoke(Library.java:199)
        at com.sun.proxy.$Proxy0.TessBaseAPICreate(Unknown Source)
        at net.sourceforge.tess4j.Tesseract.init(Tesseract.java:284)
        at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:219)
        at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:200)
        at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:184)
        (... private code ...)

Mentioned in exception file exists:

[root@XXX as]# test -e /usr/lib64/libtesseract.so.3.0.2  && echo "Found" || echo "Not found"
Found

The place in tess4j code, which throws the exception looks like:

/**
 * Initializes Tesseract engine.
 */
private void init() {
    pageNum = 0;
    api = TessAPI.INSTANCE;
    handle = api.TessBaseAPICreate();  // ERROR HERE, line #184
    api.TessBaseAPIInit2(handle, datapath, language, ocrEngineMode);
    api.TessBaseAPISetPageSegMode(handle, psm);
}

I have no idea, how to solve it, because all libraries versions are same, it works perfectly under windows.

@nguyenq, no there isn't. Should it be? As exception says, java sees this file. — Andremoniy, Aug 21 '14 at 07:54

score 0 · Accepted Answer · answered Aug 22 '14 at 14:24

0

Well, this was particular problem with that package in used OS ("ALT Linux Centaurus 6.0"). After rebuilding tesseract package from sources under that OS everything became OK.

answered Aug 22 '14 at 14:24

Andremoniy

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`UnsatisfiedLinkError` is usually indication of issues with the native library (not found, wrong version, wrong bit-ness, etc.). Glad that you figured it out. – nguyenq Aug 22 '14 at 23:19

Running tess4j (tessreact java wrapper) under Linux

1 Answers1