设置规则执行顺序的两种方法:
1、salience 这个比较容易理解
2、ruleflow-group，先在规则文件中设置组别，再在rf文件中定义规则组的执行顺序。
请看规则文件user.drl的部分定义:

rule "userRule"
	#include attributes such as "salience" here...
	no-loop true
	#salience 98
	ruleflow-group 'group1'
	when
		name is alice
		#$user : User(name == "alice")
	then 
		delete user;
		#UserAction ua = new UserAction();
		#ua.userFilter(users,$user);
end

rule "sqlRule"
	#include attributes such as "salience" here...
	no-loop true
	#salience 99
	ruleflow-group 'group2'
	when
		#only aimer can execute the sql
		#$user : User(name == "aimer")
		name is aimer
	then 
		#execute sql.
		#UserAction ua = new UserAction();
		#ua.execute(params);
		execute sql with params;
end

加载规则文件代码如下：

		Reader source = new InputStreamReader( getClass().getResourceAsStream( "/rules/user.drl" ) );
		Reader dsl = new InputStreamReader(getClass().getResourceAsStream("/rules/user.dsl"));
		PackageBuilder builder = new PackageBuilder();
		builder.addPackageFromDrl(source, dsl);
		//builder.addPackageFromDrl( source );

		source = new InputStreamReader(getClass().getResourceAsStream("/rules/test.rfm"));
		builder.addRuleFlow(source);

但是打印的信息显示并没有执行规则，或者规则执行不正确，没有出错信息。我用salience设置的话可以出现正确的结果。

rfm文件如下：

<org.drools.ruleflow.core.impl.RuleFlowProcessImpl id="1">
  <nodes id="2">
    <entry>
      <long>1</long>
      <org.drools.ruleflow.core.impl.StartNodeImpl id="3">
        <id>1</id>
        <name>Start</name>
        <incomingConnections id="4"/>
        <outgoingConnections id="5">
          <org.drools.ruleflow.core.impl.ConnectionImpl id="6">
            <type>1</type>
            <from class="org.drools.ruleflow.core.impl.StartNodeImpl" reference="3"/>
            <to class="org.drools.ruleflow.core.impl.RuleSetNodeImpl" id="7">
              <ruleFlowGroup>group1</ruleFlowGroup>
              <id>4</id>
              <name>RuleSet</name>
              <incomingConnections id="8">
                <org.drools.ruleflow.core.impl.ConnectionImpl reference="6"/>
              </incomingConnections>
              <outgoingConnections id="9">
                <org.drools.ruleflow.core.impl.ConnectionImpl id="10">
                  <type>1</type>
                  <from class="org.drools.ruleflow.core.impl.RuleSetNodeImpl" reference="7"/>
                  <to class="org.drools.ruleflow.core.impl.RuleSetNodeImpl" id="11">
                    <ruleFlowGroup>group2</ruleFlowGroup>
                    <id>6</id>
                    <name>RuleSet</name>
                    <incomingConnections id="12">
                      <org.drools.ruleflow.core.impl.ConnectionImpl reference="10"/>
                    </incomingConnections>
                    <outgoingConnections id="13">
                      <org.drools.ruleflow.core.impl.ConnectionImpl id="14">
                        <type>1</type>
                        <from class="org.drools.ruleflow.core.impl.RuleSetNodeImpl" reference="11"/>
                        <to class="org.drools.ruleflow.core.impl.EndNodeImpl" id="15">
                          <id>3</id>
                          <name>End</name>
                          <incomingConnections id="16">
                            <org.drools.ruleflow.core.impl.ConnectionImpl reference="14"/>
                          </incomingConnections>
                          <outgoingConnections id="17"/>
                        </to>
                      </org.drools.ruleflow.core.impl.ConnectionImpl>
                    </outgoingConnections>
                  </to>
                </org.drools.ruleflow.core.impl.ConnectionImpl>
              </outgoingConnections>
            </to>
          </org.drools.ruleflow.core.impl.ConnectionImpl>
        </outgoingConnections>
      </org.drools.ruleflow.core.impl.StartNodeImpl>
    </entry>
    <entry>
      <long>3</long>
      <org.drools.ruleflow.core.impl.EndNodeImpl reference="15"/>
    </entry>
    <entry>
      <long>4</long>
      <org.drools.ruleflow.core.impl.RuleSetNodeImpl reference="7"/>
    </entry>
    <entry>
      <long>6</long>
      <org.drools.ruleflow.core.impl.RuleSetNodeImpl reference="11"/>
    </entry>
  </nodes>
  <variables id="18"/>
  <lastNodeId>7</lastNodeId>
  <id>1</id>
  <name>test</name>
  <version>1.0</version>
  <type>RuleFlow</type>
  <packageName>demo</packageName>
</org.drools.ruleflow.core.impl.RuleFlowProcessImpl>

请教这样的用法有错吗？或者正确的用法是怎么样的？

搜了很久，都没有这方面的信息。我也是根据使用手册写的.