Tryed once again now it is asking for
GPG Passphrase: *
I don't know what is wrong in my flow....... i compile this time as you suggested
mvn -DskipTests=true install
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building ZXing Core 2.3-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (enforce-maven) @ core ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ core ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 221 source files to /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/build
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ core ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 120 source files to /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/test-classes
[INFO]
[INFO] --- maven-surefire-plugin:2.14.1:test (default-test) @ core ---
[INFO] Tests are skipped.
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ core ---
[INFO] Building jar: /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/core-2.3-SNAPSHOT.jar
[INFO]
[INFO] >>> maven-source-plugin:2.2.1:jar (attach-sources) @ core >>>
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (enforce-maven) @ core ---
[INFO]
[INFO] <<< maven-source-plugin:2.2.1:jar (attach-sources) @ core <<<
[INFO]
[INFO] --- maven-source-plugin:2.2.1:jar (attach-sources) @ core ---
[INFO] Building jar: /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/core-2.3-SNAPSHOT-sources.jar
[INFO]
[INFO] --- maven-javadoc-plugin:2.9:jar (attach-javadocs) @ core ---
[INFO]
Loading source files for package com.google.zxing...
Loading source files for package com.google.zxing.maxicode.decoder...
Loading source files for package com.google.zxing.maxicode...
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Loading source files for package com.google.zxing.pdf417.detector...
Constructing Javadoc information...
Standard Doclet version 1.7.0_09-icedtea
Building tree for all the packages and classes...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/com/google/zxing/BarcodeFormat.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/com/google/zxing/Binarizer.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/com/google/zxing/BinaryBitmap.html...
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Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/com/google/zxing/qrcode/encoder/package-use.html...
Building index for all the packages and classes...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/overview-tree.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/index-all.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/deprecated-list.html...
Building index for all classes...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/allclasses-frame.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/allclasses-noframe.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/index.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/overview-summary.html...
Generating /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/apidocs/help-doc.html...
1 warning
[WARNING] Javadoc Warnings
[WARNING] /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/src/com/google/zxing/pdf417/decoder/PDF417ScanningDecoder.java:292: warning - @return tag has no arguments.
[INFO] Building jar: /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/core/target/core-2.3-SNAPSHOT-javadoc.jar
[INFO]
[INFO] --- maven-dependency-plugin:2.7:copy (copy-android) @ core ---
[INFO] Configured Artifact: com.google.zxing:core:2.2-SNAPSHOT:jar
[INFO] Copying core-2.2-SNAPSHOT.jar to /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/android/libs/core-2.2-20130507.200344-19.jar
[INFO]
[INFO] --- maven-dependency-plugin:2.7:copy (copy-androidtest) @ core ---
[INFO] Configured Artifact: com.google.zxing:core:2.2-SNAPSHOT:jar
[INFO] Copying core-2.2-SNAPSHOT.jar to /home/tushar/Downloads/Android_Extra_Api/zxing-2.2/androidtest/libs/core-2.2-20130507.200344-19.jar
[INFO]
[INFO] --- maven-gpg-plugin:1.4:sign (sign-artifacts) @ core ---
GPG Passphrase: *
gpg: no default secret key: secret key not available
gpg: signing failed: secret key not available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3:00.271s
[INFO] Finished at: Tue May 14 18:44:52 GMT 2013
[INFO] Final Memory: 24M/347M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-gpg-plugin:1.4:sign (sign-artifacts) on project core: Exit code: 2 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles: