I am integrating Tesseract OCR with my Java Spring application and
encountered an issue where the application prints error messages related to
ERROR_PTR to the console. My goal is to suppress these error messages to
prevent them from being displayed.
Steps Taken
1.
*Loading Native Library for Error Suppression:*
- Created a custom native library (liberrorsuppressor.so) to suppress
the error messages.
- Compiled the library and placed it in the native directory of the
project.
- Configured DYLD_LIBRARY_PATH and java.library.path to include the
path to the custom library.
- Modified the OCRScanner class to load the native library using
System.loadLibrary("errorsuppressor").
2.
*Java Configuration:*
- Set the DYLD_LIBRARY_PATH to
/Users/oran.mor/workspace/server-services/services/dlp/native.
- Set the java.library.path to
/Users/oran.mor/workspace/server-services/services/dlp/native.
3.
*Adjustments in Code:*
- Modified the OCRScanner class:
java
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static { System.loadLibrary("errorsuppressor"); }
- Attempted to load the native library but encountered
java.lang.UnsatisfiedLinkError indicating the library could not be found
in
the specified paths.
4.
*Command-Line Configuration:*
- Attempted to run the application with additional VM options:
bash
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bootRun -x test
-Djava.library.path=/Users/oran.mor/workspace/server-services/services/dlp/native/
5.
*Creating and Using the Library:*
- Created a bin directory and compiled the custom library as
libtcnative-1.dylib.
- Placed the library in the bin directory and updated the
System.loadLibrary("tcnative-1") line in the OCRScanner class.
6.
*Handling Error Output Directly:*
- Attempted to redirect System.err in the main method to suppress
specific error messages containing "ERROR_PTR":
java
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System.setErr(new PrintStream(System.out) { @Override public void
println(String x) { if (!x.contains("ERROR_PTR")) { super.println(x); } }
});
7.
*Custom Logger Configuration:*
- Tried to configure Log4j and Logback to filter out specific error
messages:
- Log4j example:
xml
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<Filters> <RegexFilter regex=".*ERROR_PTR.*" onMatch="DENY"
onMismatch="ACCEPT"/> </Filters>
- Logback example:
xml
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<filter class="ch.qos.logback.core.filter.EvaluatorFilter">
<evaluator> <expression>return
message.contains("ERROR_PTR");</expression>
</evaluator> <onMatch>DENY</onMatch> <onMismatch>NEUTRAL</onMismatch>
</filter>
Current Status
Despite the various methods attempted, the application still prints the
ERROR_PTR messages to the console, and the libtcnative-1 library could not
be loaded successfully. I am seeking advice on alternative methods or
corrections to the steps taken to suppress these error messages effectively
in a Java Spring application integrated with Tesseract OCR.
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