exporter jaeger not work

[myc547]

env:
java-specialagent version 1.7.4
target application: springboot 2.0.0.RELEASE
config:
-javaagent:/Users/mayongchang/Downloads/opentracing-specialagent-1.7.4.jar
-Dsa.exporter=jaeger
-Dsa.init.defer=true
-Dsa.log.level=FINER
-Dsa.log.events=ERROR
-Dsa.log.file=./process.log
-DJAEGER_SERVICE_NAME=rest
-DJAEGER_REPORTER_LOG_SPANS=true
-DJAEGER_AGENT_HOST=localhost
-DJAEGER_AGENT_PORT=6831

process.log:
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public final void org.springframework.web.filter.OncePerRequestFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws javax.servlet.ServletException,java.io.IOException

TracingFilter.doFilter(RequestFacade@27802917,ResponseFacade@6a0cb6b8,ApplicationContextFacade@5fe5f601)
TracingProxyFilter.doFilter(RequestFacade@27802917,ResponseFacade@6a0cb6b8,@3b5a7c51)
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public final void org.springframework.web.filter.OncePerRequestFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws javax.servlet.ServletException,java.io.IOException
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public final void org.springframework.web.filter.OncePerRequestFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws javax.servlet.ServletException,java.io.IOException
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public final void org.springframework.web.filter.OncePerRequestFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws javax.servlet.ServletException,java.io.IOException
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public final void org.springframework.web.filter.OncePerRequestFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws javax.servlet.ServletException,java.io.IOException
-------> Intercept [FilterAgentRule@http-nio-8083-exec-7]: public void org.apache.tomcat.websocket.server.WsFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) throws java.io.IOException,javax.servlet.ServletException
<< TracingFilter.doFilter(RequestFacade@27802917,ResponseFacade@6a0cb6b8,ApplicationContextFacade@5fe5f601)
<> FilterAgentIntercept.getSatusCode(ResponseFacade@6a0cb6b8): null

jaeger agent not receive data