NPE check for constructor parameter mapperMethod

Author: abel533

src/main/java/org/apache/ibatis/builder/annotation/ProviderSqlSource.java

@@ -58,7 +58,7 @@ public ProviderSqlSource(Configuration configuration, Object provider, Class<?>
     String providerMethodName;
     try {
       this.configuration = configuration;
-      Lang lang = mapperMethod.getAnnotation(Lang.class);
+      Lang lang = mapperMethod == null ? null : mapperMethod.getAnnotation(Lang.class);
       this.languageDriver = lang == null ?
           configuration.getLanguageRegistry().getDefaultDriver() :
           configuration.getLanguageRegistry().getDriver(lang.value());