[LOG4J2-2559] NullPointerException in JdbcAppender.createAppender()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.10.0, 2.11.1, 2.11.2
• Fix Version/s: 3.0.0, 2.12.0
• Component/s: Appenders, JDBC
• Assignee: Unassigned
• Reporter: Li Lei
• Created: 27/Feb/19 02:34
• Updated: 27/Feb/19 14:58
• Resolved: 27/Feb/19 14:58

Description

 when I build the appender with 'JdbcAppender.createAppender' ,   

in static class JdbcDatabaseManagerFactory, the method  createManager  has exception that is not catched.  The code as follows:

//代码占位符
StringBuilder sb = (new StringBuilder("insert into ")).append(data.tableName).append(" (");
JdbcDatabaseManager.appendColumnNames("INSERT", data, sb);
sb.append(") values (");
int i = 1;
ColumnMapping[] arr$ = data.columnMappings;
int len$ = arr$.length;

int len$;
for(len$ = 0; len$ < len$; ++len$) {
    ColumnMapping mapping = arr$[len$];
    String mappingName = mapping.getName();
    if (Strings.isNotEmpty(mapping.getLiteralValue())) {
        JdbcDatabaseManager.logger().trace("Adding INSERT VALUES literal for ColumnMapping[{}]: {}={} ", i, mappingName, mapping.getLiteralValue());
        sb.append(mapping.getLiteralValue());
    } else if (Strings.isNotEmpty(mapping.getParameter())) {
        JdbcDatabaseManager.logger().trace("Adding INSERT VALUES parameter for ColumnMapping[{}]: {}={} ", i, mappingName, mapping.getParameter());
        sb.append(mapping.getParameter());
    } else {
        JdbcDatabaseManager.logger().trace("Adding INSERT VALUES parameter marker for ColumnMapping[{}]: {}={} ", i, mappingName, '?');
        sb.append('?');
    }

    sb.append(',');
    ++i;
}

because I wanto use columnConfig,  and  the variable 'columnMappings' is null,  so there mayby a NullPointerException here.....

 

the stack as follow

 

//代码占位符
Caused by: java.lang.NullPointerException
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.appendColumnNames(JdbcDatabaseManager.java:342) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.access$100(JdbcDatabaseManager.java:62) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager$JdbcDatabaseManagerFactory.createManager(JdbcDatabaseManager.java:113) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager$JdbcDatabaseManagerFactory.createManager(JdbcDatabaseManager.java:104) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:113) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.getManager(AbstractDatabaseManager.java:87) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.getManager(JdbcDatabaseManager.java:446) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcAppender$Builder.build(JdbcAppender.java:95) ~[log4j-core-2.11.2.jar:2.11.2]
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcAppender.createAppender(JdbcAppender.java:202) ~[log4j-core-2.11.2.jar:2.11.2]