websphere liberty - SLF4J jars與websphere內部包沖突

Question

我有一個OSGi應用程序，包含3個包 -

1 - LoggingWrapper，它充當log4j和slf4j jar的包裝器，並導出org.slf4j。*包。

2 - MyProject，它包含JPA代碼，並導入以下包：

Import-Package: javax.management,
 javax.naming,
 javax.persistence;version="1.1.0",
 javax.persistence.criteria;version="1.1.0",
 javax.persistence.metamodel;version="1.1.0",
 javax.sql;version="0.0.0",
 javax.transaction;version="1.1.0",
 javax.transaction.xa;version="1.1.0",
 org.apache.openjpa.enhance;version="2.2.0",
 org.apache.openjpa.util;version="2.2.0",
 org.slf4j

在服務器上部署它會導致以下錯誤：

[AUDIT   ] CWWKZ0404E: An exception was generated when trying to resolve the contents of the application JpaTestApp.  The exception text from the OSGi framework is: Uses constraint violation. Unable to resolve resource MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar] because it is exposed to package 'org.slf4j' from resources LoggingWrapper [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/LoggingWrapper_1.0.0.jar] and com.ibm.ws.slf4j-api.1.7.7 [osgi.identity; osgi.identity="com.ibm.ws.slf4j-api.1.7.7"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"] via two dependency chains.

Chain 1:
  MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar]
    import: (&(osgi.wiring.package=org.slf4j)(version>=0.0.0))
     |
    export: osgi.wiring.package: org.slf4j
  LoggingWrapper [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/LoggingWrapper_1.0.0.jar]

Chain 2:
  MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar]
    import: (&(osgi.wiring.package=org.apache.openjpa.util)(version>=2.2.0))
     |
    export: osgi.wiring.package=org.apache.openjpa.util; uses:=org.slf4j
  com.ibm.ws.jpa [osgi.identity; osgi.identity="com.ibm.ws.jpa"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"]
    import: (osgi.wiring.package=org.slf4j)
     |
    export: osgi.wiring.package: org.slf4j
  com.ibm.ws.slf4j-api.1.7.7 [osgi.identity; osgi.identity="com.ibm.ws.slf4j-api.1.7.7"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"]
[AUDIT   ] CWWKZ0020I: Application JpaTestApp not updated.

從應用程序中刪除“LoggingWrapper”捆綁包會導致以下錯誤：

[AUDIT   ] CWWKZ0058I: Monitoring dropins for applications. 
[AUDIT   ] CWWKZ0404E: An exception was generated when trying to resolve the contents of the application JpaTestApp.  The exception text from the OSGi framework is: Unable to resolve IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/experimentalServer/apps/JpaTestApp.eba/XLetDBUtility_1.0.0.jar: missing requirement org.apache.aries.subsystem.core.archive.ImportPackageRequirement: namespace=osgi.wiring.package, attributes={}, directives={filter=(&(osgi.wiring.package=org.slf4j)(version>=0.0.0))}, resource=IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/experimentalServer/apps/JpaTestApp.eba/XLetDBUtility_1.0.0.jar
[AUDIT   ] CWWKZ0012I: The application JpaTestApp was not started.

如何解決這些錯誤？

Answer 1

雖然Liberty旨在將應用程序與運行時中包含的開源庫（例如slf4j）隔離開來，但是如果導入了一些openjpa軟件包，似乎會有一些泄漏。 您應該能夠在應用程序中使用JPA而無需導入org.apache.openjpa *包，因此最好的辦法是避免使用它們。 切換到動態運行時增強（而不是構建時增強）將保存構建步驟，並允許您刪除openjpa包導入。