Prevent infinite loop when throw Exception that hold cause from provider method

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

@@ -173,7 +173,7 @@ private SqlSource createSqlSource(Object parameterObject) {
   private Throwable extractRootCause(Exception e) {
     Throwable cause = e;
     while(cause.getCause() != null) {
-      cause = e.getCause();
+      cause = cause.getCause();
     }
     return cause;
   }

src/test/java/org/apache/ibatis/submitted/sqlprovider/SqlProviderTest.java

@@ -22,7 +22,6 @@
 import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.Reader;
-import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -391,6 +390,20 @@ void invokeError() throws NoSuchMethodException {
     }
   }
 
+  @Test
+  void invokeNestedError() throws NoSuchMethodException {
+    try {
+      Class<?> mapperType = ErrorMapper.class;
+      Method mapperMethod = mapperType.getMethod("invokeNestedError");
+      new ProviderSqlSource(new Configuration(),
+        mapperMethod.getAnnotation(SelectProvider.class), mapperType, mapperMethod)
+        .getBoundSql(new Object());
+      fail();
+    } catch (BuilderException e) {
+      assertTrue(e.getMessage().contains("Error invoking SqlProvider method 'public java.lang.String org.apache.ibatis.submitted.sqlprovider.SqlProviderTest$ErrorSqlBuilder.invokeNestedError()' with specify parameter 'class java.lang.Object'.  Cause: java.lang.UnsupportedOperationException: invokeNestedError"));
+    }
+  }
+
   @Test
   void invalidArgumentsCombination() throws NoSuchMethodException {
     try {
@@ -670,6 +683,9 @@ public interface ErrorMapper {
     @SelectProvider(type = ErrorSqlBuilder.class, method = "invokeError")
     void invokeError();
 
+    @SelectProvider(type = ErrorSqlBuilder.class, method = "invokeNestedError")
+    void invokeNestedError();
+
     @SelectProvider(type = ErrorSqlBuilder.class, method = "multipleProviderContext")
     void multipleProviderContext();
 
@@ -702,6 +718,10 @@ public String invokeError() {
       throw new UnsupportedOperationException("invokeError");
     }
 
+    public String invokeNestedError() {
+      throw new IllegalStateException(new UnsupportedOperationException("invokeNestedError"));
+    }
+
     public String multipleProviderContext(ProviderContext providerContext1, ProviderContext providerContext2) {
       throw new UnsupportedOperationException("multipleProviderContext");
     }