Use log4j for errors in CopyOnWriteContext.cpp.
Use log4j for errors in CopyOnWriteContext.cpp.

migue/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,ingted/voltdb,deerwalk/voltdb,wolffcm/voltdb,kumarrus/voltdb,deerwalk/voltdb,wolffcm/voltdb,migue/voltdb,wolffcm/voltdb,paulmartel/voltdb,VoltDB/voltdb,ingted/voltdb,zuowang/voltdb,creative-quant/voltdb,paulmartel/voltdb,flybird119/voltdb,creative-quant/voltdb,migue/voltdb,deerwalk/voltdb,deerwalk/voltdb,wolffcm/voltdb,flybird119/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,zuowang/voltdb,creative-quant/voltdb,kumarrus/voltdb,creative-quant/voltdb,creative-quant/voltdb,zuowang/voltdb,flybird119/voltdb,migue/voltdb,simonzhangsm/voltdb,flybird119/voltdb,zuowang/voltdb,VoltDB/voltdb,flybird119/voltdb,creative-quant/voltdb,kumarrus/voltdb,wolffcm/voltdb,VoltDB/voltdb,migue/voltdb,ingted/voltdb,zuowang/voltdb,zuowang/voltdb,deerwalk/voltdb,wolffcm/voltdb,zuowang/voltdb,ingted/voltdb,paulmartel/voltdb,flybird119/voltdb,paulmartel/voltdb,kumarrus/voltdb,VoltDB/voltdb,paulmartel/voltdb,kumarrus/voltdb,flybird119/voltdb,zuowang/voltdb,flybird119/voltdb,migue/voltdb,ingted/voltdb,ingted/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,VoltDB/voltdb,creative-quant/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,migue/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,deerwalk/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,ingted/voltdb,paulmartel/voltdb,creative-quant/voltdb,paulmartel/voltdb,migue/voltdb,ingted/voltdb,deerwalk/voltdb,kumarrus/voltdb,deerwalk/voltdb,simonzhangsm/voltdb