Patrick0308 commented on a change in pull request #5109:
URL: https://github.com/apache/skywalking/pull/5109#discussion_r456210367
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File path:
apm-sniffer/apm-sdk-plugin/mysql-common/src/main/java/org/apache/skywalking/apm/plugin/jdbc/mysql/PreparedStatementExecuteMethodsInterceptor.java
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@@ -40,15 +40,14 @@
public final void beforeMethod(EnhancedInstance objInst, Method method,
Object[] allArguments,
Class<?>[] argumentsTypes,
MethodInterceptResult result) {
StatementEnhanceInfos cacheObject = (StatementEnhanceInfos)
objInst.getSkyWalkingDynamicField();
- ConnectionInfo connectInfo = cacheObject.getConnectionInfo();
/**
* For avoid NPE. In this particular case, Execute sql inside the
{@link com.mysql.jdbc.ConnectionImpl} constructor,
* before the interceptor sets the connectionInfo.
- *
+ * Fixed https://github.com/apache/skywalking/issues/4965. When
invoking prepareCall, cacheObject is null. Because it will determine
procedures's parameter types by querying the table of proc in mysql.
* @see JDBCDriverInterceptor#afterMethod(EnhancedInstance, Method,
Object[], Class[], Object)
*/
- if (connectInfo != null) {
-
+ if (cacheObject != null && cacheObject.getConnectionInfo() != null) {
Review comment:
Intercepter set `connectionInfo` after `Driver.connect`. So, in the
constructor of `ConnectionImpl`, executing built-in SQL will don't have
`connectionInfo`.
https://github.com/apache/skywalking/blob/e7e72d937b769f40e50ec644a210bc497f2204f9/apm-sniffer/apm-sdk-plugin/mysql-common/src/main/java/org/apache/skywalking/apm/plugin/jdbc/mysql/PreparedStatementExecuteMethodsInterceptor.java#L44
Both the condition `cacheObject.getConnectionInfo() != null` and the
condition `cacheObject != null` are for not log error message and skip the
jdbc's built-in SQL.
The NPE not affect recording user's SQL.
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