apm-sniffer/apm-sdk-plugin/tomcat-10x-plugin/src/main/java/org/apache/skywalking/apm/plugin/tomcat10x/TomcatInvokeInterceptor.java [98:114]:
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    private void collectHttpParam(Request request, AbstractSpan span) {
        final Map<String, String[]> parameterMap = new HashMap<>();
        final org.apache.coyote.Request coyoteRequest = request.getCoyoteRequest();
        final Parameters parameters = coyoteRequest.getParameters();
        for (final Enumeration<String> names = parameters.getParameterNames(); names.hasMoreElements(); ) {
            final String name = names.nextElement();
            parameterMap.put(name, parameters.getParameterValues(name));
        }

        if (!parameterMap.isEmpty()) {
            String tagValue = CollectionUtil.toString(parameterMap);
            tagValue = TomcatPluginConfig.Plugin.Http.HTTP_PARAMS_LENGTH_THRESHOLD > 0 ?
                StringUtil.cut(tagValue, TomcatPluginConfig.Plugin.Http.HTTP_PARAMS_LENGTH_THRESHOLD) :
                tagValue;
            Tags.HTTP.PARAMS.set(span, tagValue);
        }
    }
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apm-sniffer/apm-sdk-plugin/tomcat-7.x-8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/tomcat78x/TomcatInvokeInterceptor.java [118:134]:
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    private void collectHttpParam(Request request, AbstractSpan span) {
        final Map<String, String[]> parameterMap = new HashMap<>();
        final org.apache.coyote.Request coyoteRequest = request.getCoyoteRequest();
        final Parameters parameters = coyoteRequest.getParameters();
        for (final Enumeration<String> names = parameters.getParameterNames(); names.hasMoreElements(); ) {
            final String name = names.nextElement();
            parameterMap.put(name, parameters.getParameterValues(name));
        }

        if (!parameterMap.isEmpty()) {
            String tagValue = CollectionUtil.toString(parameterMap);
            tagValue = TomcatPluginConfig.Plugin.Http.HTTP_PARAMS_LENGTH_THRESHOLD > 0 ?
                StringUtil.cut(tagValue, TomcatPluginConfig.Plugin.Http.HTTP_PARAMS_LENGTH_THRESHOLD) :
                tagValue;
            Tags.HTTP.PARAMS.set(span, tagValue);
        }
    }
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